Remove ansible<2.2 apt cache hack
Remove ansible<2.2 apt cache hack

Now ansible apt module correctly behaves, so it's time
to deprecate these cruft tasks for apt.

Change-Id: If91782644592f70d348ea60b25f010d67c7db988

openstack/openstack-ansible-rsyslog_client,openstack/openstack-ansible-rsyslog_client