Let magnum jobs to use ceilometer devstack plugin
Let magnum jobs to use ceilometer devstack plugin

Ceilometer is moving to being a devstack plugin. This change updates
magnum jenkins jobs to use ceilometer plugin instead.

Change-Id: I1f412924bc63e27080db8b2a1847f77a2bab1885
Related-Bug: #1489436

openstack-infra/project-config,noorul/os-project-config,openstack-infra/project-config,noorul/os-project-config,dongwenjuan/project-config,Tesora/tesora-project-config,Tesora/tesora-project-config,dongwenjuan/project-config