Remove unused galera_address from playbook
Remove unused galera_address from playbook

Ceilometer has no hard dependency on galera so this variable is
unnecessary.

Depends-On: If8780ddc85f18f93facc9ee61e773f602f03ccc5
Change-Id: I336dea8b1f303aa0f0fc3ac45f9c7664b6566600

yanyao/openstack-ansible,cloudnull/os-ansible-deployment,mancdaz/openstack-ansible,major/openstack-ansible,Logan2211/openstack-ansible,robb-romans/openstack-ansible,major/openstack-ansible,BjoernT/os-ansible-deployment,cfarquhar/openstack-ansible,weezer/openstack-ansible,mrda/openstack-ansible,os-cloud/os-ansible-deployment,cloudnull/os-ansible-deployment,yanyao/newton,os-cloud/os-ansible-deployment,BjoernT/openstack-ansible,robb-romans/openstack-ansible,bunchc/openstack-ansible,openstack/openstack-ansible,BjoernT/os-ansible-deployment,BjoernT/openstack-ansible,Logan2211/openstack-ansible,mrda/openstack-ansible,openstack/openstack-ansible,mrda/openstack-ansible,yanyao/openstack-ansible,major/os-ansible-deployment,mancdaz/openstack-ansible,cfarquhar/openstack-ansible,major/os-ansible-deployment,BjoernT/os-ansible-deployment,stackforge/os-ansible-deployment,yanyao/newton,weezer/openstack-ansible,bunchc/openstack-ansible,stackforge/os-ansible-deployment