Remove redundant vars line
Remove redundant vars line

This line snuck in with Icfa97babeb7034cab623aca883bb83d5a07f7233
probably to bring it in line with other OSA roles, but should already
be covered by the distribution_major_version line above.

Change-Id: Ifa5d05a70988962e2bce8538204ddd3131ad6003

openstack/openstack-ansible-lxc_hosts,openstack/openstack-ansible-lxc_hosts