Add missing ceilometer related imports to upgrade.py
Add missing ceilometer related imports to upgrade.py

Change-Id: If10c37f7f0c81fcd4076909712fde898fb19e9a8
Closes-Bug: #1562963
(cherry picked from commit cc9cdf350186c810e6d6339c3685f1f289578362)

Juniper/contrail-fabric-utils,Juniper/contrail-fabric-utils