Robustify of rabbitmq upgrade
Robustify of rabbitmq upgrade

String parsing for gospel node detection was overly complex and not
robust. Hopefully this will make it better.

Closes-bug: #1573684
Change-Id: I12e869eff274d286d239c4f55cc4b4ddca389bbd

rahulunair/kolla,stackforge/kolla,intel-onp/kolla,mandre/kolla,dardelean/kolla-ansible,mandre/kolla,tonyli71/kolla,nihilifer/kolla,nihilifer/kolla,rahulunair/kolla,stackforge/kolla,dardelean/kolla-ansible,GalenMa/kolla,dardelean/kolla-ansible,mrangana/kolla,stackforge/kolla,openstack/kolla,tonyli71/kolla,coolsvap/kolla,mrangana/kolla,coolsvap/kolla,coolsvap/kolla,openstack/kolla,mandre/kolla,intel-onp/kolla,GalenMa/kolla