move pacemaker_vip_primitive definition to crowbar-pacemaker cookbook

The pacemaker_vip_primitive definition only works in a Crowbar
environment (due to retrieving the VIP name/address from Crowbar's
data bag for the relevant network), so it belongs in the
crowbar-pacemaker cookbook not the pacemaker cookbook.
Merge pull request #81 from aspiers/move-vip-definition

move pacemaker_vip_primitive definition to crowbar-pacemaker cookbook