Fix idempotency regex during scale-up check
Fix idempotency regex during scale-up check

When a new node must be added in the cluster, an Exec resource
calls pcs, only if the node is not already present in the cluster.
The current regex doesn't match pcs' output because of a
unecessary beg-of-line marker, so fix it accordingly.

Change-Id: Ie0f549ba968f4f11b30705cc9c80856186dfccda
Closes-Bug: #1950294

openstack/puppet-pacemaker,openstack/puppet-pacemaker,openstack/puppet-pacemaker,openstack/puppet-pacemaker