Added MongoDB for Ceilometer

Rebased onto synced upstream for mongodb v 0.7.0
CI retest

Depends on   Fuel Web https://review.openstack.org/#/c/71883
Partial (Stage 2) blueprint: ceilometer-fuel-integraition
Change-Id: I1cd3160ef9fb2c13b31318669cd35f7a3902f7c5
Merge "Added MongoDB for Ceilometer"