Allow outward_rabbitmq with enable_outward_rabbitmq
Allow outward_rabbitmq with enable_outward_rabbitmq

outward_rabbitmq is determined  using enable_outward_rabbitmq
property rather than current haproxy_enable_external_vip

Change-Id: Iee096ab50fd4d9f5f3fe05880d0e0a7842c59d0a
Closes-Bug: 1722854

dardelean/kolla-ansible,dardelean/kolla-ansible,dardelean/kolla-ansible