Creating openshift_logging role for deploying Aggregated Logging without a deployer image

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+## openshift_logging Role
+
+### Please note this role is still a work in progress
+
+This role is used for installing the Aggregated Logging stack. It should be run against
+a single host, it will create any missing certificates and API objects that the current
+[logging deployer](https://github.com/openshift/origin-aggregated-logging/tree/master/deployer) does.
+
+As part of the installation, it is recommended that you add the Fluentd node selector label
+to the list of persisted [node labels](https://docs.openshift.org/latest/install_config/install/advanced_install.html#configuring-node-host-labels).
+
+###Required vars:
+
+- `openshift_logging_install_logging`: When `True` the `openshift_logging` role will install Aggregated Logging.
+- `openshift_logging_upgrade_logging`:  When `True` the `openshift_logging` role will upgrade Aggregated Logging.
+
+When both `openshift_logging_install_logging` and `openshift_logging_upgrade_logging` are `False` the `openshift_logging` role will uninstall Aggregated Logging.
+
+###Optional vars:
+
+- `openshift_logging_image_prefix`: The prefix for the logging images to use. Defaults to 'docker.io/openshift/origin-'.
+- `openshift_logging_image_version`: The image version for the logging images to use. Defaults to 'latest'.
+- `openshift_logging_use_ops`: If 'True', set up a second ES and Kibana cluster for infrastructure logs. Defaults to 'False'.
+- `master_url`: The URL for the Kubernetes master, this does not need to be public facing but should be accessible from within the cluster. Defaults to 'https://kubernetes.default.svc.cluster.local'.
+- `public_master_url`: The public facing URL for the Kubernetes master, this is used for Authentication redirection. Defaults to 'https://localhost:8443'.
+- `openshift_logging_namespace`: The namespace that Aggregated Logging will be installed in. Defaults to 'logging'.
+- `openshift_logging_curator_default_days`: The default minimum age (in days) Curator uses for deleting log records. Defaults to '30'.
+- `openshift_logging_curator_run_hour`: The hour of the day that Curator will run at. Defaults to '0'.
+- `openshift_logging_curator_run_minute`: The minute of the hour that Curator will run at. Defaults to '0'.
+- `openshift_logging_curator_run_timezone`: The timezone that Curator uses for figuring out its run time. Defaults to 'UTC'.
+- `openshift_logging_curator_script_log_level`: The script log level for Curator. Defaults to 'INFO'.
+- `openshift_logging_curator_log_level`: The log level for the Curator process. Defaults to 'ERROR'.
+- `openshift_logging_curator_cpu_limit`: The amount of CPU to allocate to Curator. Default is '100m'.
+- `openshift_logging_curator_memory_limit`: The amount of memor to allocate to Curator. Unset if not specified.
+
+- `openshift_logging_kibana_hostname`: The Kibana hostname. Defaults to 'kibana.example.com'.
+- `openshift_logging_kibana_cpu_limit`: The amount of CPU to allocate to Kibana or unset if not specified.
+- `openshift_logging_kibana_memory_limit`: The amount of memory to allocate to Kibana or unset if not specified.
+- `openshift_logging_kibana_proxy_debug`: When "True", set the Kibana Proxy log level to DEBUG. Defaults to 'false'.
+- `openshift_logging_kibana_proxy_cpu_limit`: The amount of CPU to allocate to Kibana proxy or unset if not specified.
+- `openshift_logging_kibana_proxy_memory_limit`: The amount of memory to allocate to Kibana proxy or unset if not specified.
+
+- `openshift_logging_fluentd_nodeselector`: The node selector that the Fluentd daemonset uses to determine where to deploy to. Defaults to '"logging-infra-fluentd": "true"'.
+- `openshift_logging_fluentd_cpu_limit`: The CPU limit for Fluentd pods. Defaults to '100m'.
+- `openshift_logging_fluentd_memory_limit`: The memory limit for Fluentd pods. Defaults to '512Mi'.
+- `openshift_logging_fluentd_es_copy`: Whether or not to use the ES_COPY feature for Fluentd (DEPRECATED). Defaults to 'False'.
+- `openshift_logging_fluentd_use_journal`: Whether or not Fluentd should read log entries from Journal. Defaults to 'False'. NOTE: Fluentd will attempt to detect whether or not Docker is using the journald log driver and may overwrite this value.
+- `openshift_logging_fluentd_journal_read_from_head`: Whether or not Fluentd will try to read from the head of Journal when first starting up, using this may cause a delay in ES receiving current log records. Defaults to 'False'.
+- `openshift_logging_fluentd_hosts`: List of nodes that should be labeled for Fluentd to be deployed to. Defaults to ['--all'].
+
+- `openshift_logging_es_host`: The name of the ES service Fluentd should send logs to. Defaults to 'logging-es'.
+- `openshift_logging_es_port`: The port for the ES service Fluentd should sent its logs to. Defaults to '9200'.
+- `openshift_logging_es_ca`: The location of the ca Fluentd uses to communicate with its openshift_logging_es_host. Defaults to '/etc/fluent/keys/ca'.
+- `openshift_logging_es_client_cert`: The location of the client certificate Fluentd uses for openshift_logging_es_host. Defaults to '/etc/fluent/keys/cert'.
+- `openshift_logging_es_client_key`: The location of the client key Fluentd uses for openshift_logging_es_host. Defaults to '/etc/fluent/keys/key'.
+
+- `openshift_logging_es_cluster_size`: The number of ES cluster members. Defaults to '1'.
+- `openshift_logging_es_cpu_limit`:  The amount of CPU limit for the ES cluster.  Unused if not set
+- `openshift_logging_es_memory_limit`: The amount of RAM that should be assigned to ES. Defaults to '1024Mi'.
+- `openshift_logging_es_pv_selector`: A key/value map added to a PVC in order to select specific PVs.  Defaults to 'None'.
+- `openshift_logging_es_pvc_dynamic`: Whether or not to add the dynamic PVC annotation for any generated PVCs. Defaults to 'False'.
+- `openshift_logging_es_pvc_size`: The requested size for the ES PVCs, when not provided the role will not generate any PVCs. Defaults to '""'.
+- `openshift_logging_es_pvc_prefix`: The prefix for the generated PVCs. Defaults to 'logging-es'.
+- `openshift_logging_es_recover_after_time`: The amount of time ES will wait before it tries to recover. Defaults to '5m'.
+- `openshift_logging_es_storage_group`: The storage group used for ES. Defaults to '65534'.
+
+When `openshift_logging_use_ops` is `True`, there are some additional vars. These work the
+same as above for their non-ops counterparts, but apply to the OPS cluster instance:
+- `openshift_logging_es_ops_host`: logging-es-ops
+- `openshift_logging_es_ops_port`: 9200
+- `openshift_logging_es_ops_ca`: /etc/fluent/keys/ca
+- `openshift_logging_es_ops_client_cert`: /etc/fluent/keys/cert
+- `openshift_logging_es_ops_client_key`: /etc/fluent/keys/key
+- `openshift_logging_es_ops_cluster_size`: 1
+- `openshift_logging_es_ops_cpu_limit`:  The amount of CPU limit for the ES cluster.  Unused if not set
+- `openshift_logging_es_ops_memory_limit`: 1024Mi
+- `openshift_logging_es_ops_pvc_dynamic`: False
+- `openshift_logging_es_ops_pvc_size`: ""
+- `openshift_logging_es_ops_pvc_prefix`: logging-es-ops
+- `openshift_logging_es_ops_recover_after_time`: 5m
+- `openshift_logging_es_ops_storage_group`: 65534
+- `openshift_logging_kibana_ops_hostname`: The Operations Kibana hostname. Defaults to 'kibana-ops.example.com'.
+- `openshift_logging_kibana_ops_cpu_limit`: The amount of CPU to allocate to Kibana or unset if not specified.
+- `openshift_logging_kibana_ops_memory_limit`: The amount of memory to allocate to Kibana or unset if not specified.
+- `openshift_logging_kibana_ops_proxy_cpu_limit`: The amount of CPU to allocate to Kibana proxy or unset if not specified.
+- `openshift_logging_kibana_ops_proxy_memory_limit`: The amount of memory to allocate to Kibana proxy or unset if not specified.