Ceilometer polling agents merge

Early in the kilo cycle ceilometer compute agent and ceilometer central agent were merged to one service called ceilometer-polling. Functionality of this service depends on the node where it will be running - controller node or compute.

We need to implement this feature support in mos that include followin steps to be done:
1. Update ceilometer packages
2. Update puppets to configure new polling agent

Upstream spec: https://github.com/openstack/ceilometer-specs/blob/master/specs/kilo/merge-compute-and-central-agents.rst
Upstream code changes: https://review.openstack.org/#/q/status:merged++branch:master+topic:merge-compute-and-central-agents,n,z