Also tie Haproxy_service to nova_floating_range waits

This commit makes all openstack::ha::haproxy_service
finish before we start checking for backends for
nova_floating_range.

Change-Id: I300c02290095ad1242524fb79c6d722941c1218f
Closes-bug: #1381982
Merge "Also tie Haproxy_service to nova_floating_range waits" into stable/5.0