Add unzip to Centos pkg list
Add unzip to Centos pkg list

Unzip is needed for ansible unarchive module to work properly.

Change-Id: I315b4bba0c91c82ffe71d1fbf763409774ce1642
Partial-Bug: #1718979

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