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: I315a5bdb2f92544433638165c93ec21cb7db99ae

openstack/openstack-ansible-rsyslog_server,openstack/openstack-ansible-rsyslog_server