[system-tests] Set up Rally on master node for load/benchmark testing of Fuel and MOS

[Tatyanka]

We need to use Rally in system tests in order to perform load tests and to be able to measure performance of different Fuel/MOS components during tests. Rally can be installed as docker container on master node or as a plugin/role on a separate slave node. In first case it's necessary to use proxy from admin network to management, because master node is connected to admin net only.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/175966

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/182577

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/6.1
Review: https://review.openstack.org/196997

[OpenStack Infra (hudson-openstack)]

Change abandoned by Artem Panchenko (<email address hidden>) on branch: master
Review: https://review.openstack.org/175966
Reason: https://review.openstack.org/182577

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/196997
Committed: https://git.openstack.org/cgit/stackforge/fuel-qa/commit/?id=40e73acaca01766356f89da580942a521cde3b44
Submitter: Jenkins
Branch: stable/6.1

commit 40e73acaca01766356f89da580942a521cde3b44
Author: Artem Panchenko <email address hidden>
Date: Tue May 12 14:35:46 2015 +0300

    Add Rally benchmark tool to the system tests

    Add possibility to use Rally tool during system tests:
     - allow installation of Rally on master node in
       Docker container;
     - creation of Rally Deployments and Tasks from system
       tests;
     - running Rally benchmark tests against environments
       deployed by system tests;
     - fetching and comparing benchmarks results.

    Closes-bug: #1269862

    Change-Id: I2ab7a0b13eecf4ddef3b14cea46b785bcabca5a1