Fixes missing CephClientKey generation

In newer OOO deployments, the keys for ceph are dynamically generated.

Also removes tacker client patch for symmetrical as it is already
present in stable/pike:
https://github.com/openstack/python-tackerclient/commit/682c9651085214a58434ad6016d93b2cdc8f3462

JIRA: APEX-563

Change-Id: I01fb617b026bae5d6e265a4afbac270939627c5a
Signed-off-by: Tim Rozet <trozet@redhat.com>