Allow a log dir that isn't the "service_name"

Galera logs by default to /var/log/mysql_logs these logs are being
ignored and not mounted properly on the host server, because the
service_name that is used to mount the log directory is "galera" and not
"mysql_logs".

This patch adds an option to set the log_directory specifically inside
the env.d yml files, but defaults to "service_name" when the
log_directory option isn't set. This will mean functionality remains
unchanged for all services.

Additionally, the log_directory has changed to "mysql_logs" for galera
containers, to resolve the galera log issue.

Change-Id: I18400248da455156dbba31b9c2ff254b58c51673
Closes-Bug: #1486955

etc/openstack_deploy/env.d/galera.yml

@@ -27,5 +27,6 @@ container_skel:
     contains:
       - galera
     properties:
+      log_directory: mysql_logs
       service_name: galera
       container_release: trusty

playbooks/roles/lxc_container_create/tasks/container_create.yml

@@ -97,10 +97,10 @@
     name: "{{ inventory_hostname }}"
     container_command: |
       mkdir -p /var/backup
-      mkdir -p /var/log/{{ properties.service_name }}
+      mkdir -p /var/log/{{ properties.log_directory | default(properties.service_name) }}
     container_config:
       - "lxc.mount.entry=/openstack/backup/{{ inventory_hostname }} var/backup none defaults,bind,rw 0 0"
-      - "lxc.mount.entry=/openstack/log/{{ inventory_hostname }} var/log/{{ properties.service_name }} none defaults,bind,rw 0 0"
+      - "lxc.mount.entry=/openstack/log/{{ inventory_hostname }} var/log/{{ properties.log_directory | default(properties.service_name) }} none defaults,bind,rw 0 0"
       - "lxc.aa_profile=lxc-openstack"
   when: properties.service_name is defined
   delegate_to: "{{ physical_host }}"