[system_tests] Implement tests for verification deployment of ceilometer with mongo

[Tatyanka]

Implement tests to verify deployment of ceilometer with mongo:
- simple with dedicated role mongo
- simple with mutirole mongo
- ha
- ha mongo failover

Also need to add tests that provide measurement for read/write operation if mongo is used for ceilometer when big count of instance is created.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/71617

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/71617
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=8603b2993fdeb788ec5c24a6922115f298931a3c
Submitter: Jenkins
Branch: master

commit 8603b2993fdeb788ec5c24a6922115f298931a3c
Author: TatyanaLeontovich <email address hidden>
Date: Thu Feb 6 20:04:10 2014 +0200

    Add test for ceilometer deployment with mongo

    Add verification for ceilometer deployment with mongo:
    * deploy simple with mongo(mongo on separate node)
    * deploy multinode with mongo (mongo with other roles)
    * deploy ha (mongo on separate node)
    * deploy ha multinode(mongo with controllers)

    Change-Id: I60553788a3ce277bf1b9db262b23e71a2969918f
    Closes-bug: #1277037