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: I25d751c380f890a411bdeff56162adf0711f68f1

openstack/openstack-ansible-pip_install,openstack/openstack-ansible-pip_install,os-cloud/openstack-ansible-pip_install,os-cloud/openstack-ansible-pip_install