Problem: task "check for a ceph socket in containerized deployment" will
be skipped if we are not an OSD.
with_items are still evaluated before when conditions so if the task was
skipped the dict will be empty and then fail.
Adding a "not skipped" condition skips the execution of the task.
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1482061
Signed-off-by: Sébastien Han <seb@redhat.com>