Comment 4 for bug 1493799

Reviewed: https://review.openstack.org/222610
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible/commit/?id=ba4661296ce3f9703748c6a2843cd7ff63712db4
Submitter: Jenkins
Branch: kilo

commit ba4661296ce3f9703748c6a2843cd7ff63712db4
Author: Matt Thompson <email address hidden>
Date: Wed Sep 9 12:07:50 2015 +0100

    Ensure cinder-backup-related variables are defined

    This commit simply updates ceph_client/tasks/ceph_auth.yml to ensure
    that cinder_service_backup_program_enabled and
    cinder_service_backup_driver are defined before trying to evaluate
    them. On a normal deployment, this is not an issue but when running
    os-nova-install.yml on an AIO where ceph support is enabled, this
    variable evaluation fails as the AIO host is part of both cinder_backup
    and nova_compute groups, but does not have access to these variable
    defaults in os_cinder/defaults/main.yml since we're operating on the
    os_nova role.

    An alternate solution would be to add these variable defaults to
    group_vars, however as the os_nova role doesn't actually need to use
    them it's probably cleaner to just check if they're defined.

    Change-Id: I2c35b14f42b2c452aa68a611ab68c612db1b07a4
    Closes-Bug: #1493799
    (cherry picked from commit 466de05c67fa4ea071909a20872c3876711a5c23)