Remove the legacy cache creation process
Remove the legacy cache creation process

This change removes the legacy cache creation process which was used to
provide compatibility until the needed changes were merged into the lxc
container create role. Because everything needed is now upstream as found
here: [0] the legacy cache task has been removed.

This change also addresses an Ansible lint issue by moving the existing
cache cleanup task to an idempotent one.

[0] - https://review.openstack.org/#/c/311796/

Change-Id: I2950348c99e4eca7c0205d8674d77393816debe8
Signed-off-by: Kevin Carter <ffb54fded2f22052678e45d78b58d223654eb6fa@rackspace.com>

openstack/openstack-ansible-lxc_hosts,os-cloud/openstack-ansible-lxc_hosts,openstack/openstack-ansible-lxc_hosts,os-cloud/openstack-ansible-lxc_hosts