Added pool part for repo_cache
Added pool part for repo_cache

According to https://github.com/openstack/openstack-ansible/commit/c9925bee814dd1ee25ac4f6d29d31922c43eb0f3
The repo servers now use cache. This updates the f5 script to
include the configuration for the cache instructions.

shannonmitchell/rpc-openstack,git-harry/rpc-openstack,major/rpc-openstack,cloudnull/rpc-openstack,shannonmitchell/rpc-openstack,rcbops/rpc-openstack,robb-romans/rpc-openstack,jacobwagner/rpc-openstack,cloudnull/rpc-openstack,rcbops/rpc-openstack,hughsaunders/rpc-openstack,prometheanfire/rpc-openstack,mancdaz/rpc-openstack,major/rpc-openstack,galstrom21/rpc-openstack,BjoernT/rpc-openstack,BjoernT/rpc-openstack,galstrom21/rpc-openstack,git-harry/rpc-openstack,cfarquhar/rpc-openstack,prometheanfire/rpc-openstack,hughsaunders/rpc-openstack,jacobwagner/rpc-openstack,cfarquhar/rpc-openstack,mancdaz/rpc-openstack,robb-romans/rpc-openstack