Call rally-manage with warning when openstack-rally-manage is used

Currently when openstack-rally-manage is used, args are passed through
to rally, not rally-manage. This patch fixes this situation.

Change-Id: I51fe14068f679d7f65fb4e518b8f55beca1c7d72
Closes-Bug: #1274068
Move cleanup functions to benchmark.utils

This is an initial effort to cleanup ScenarioRunner before it is
refactored to sparate scenario types.

Change-Id: Icd2002b3a8919bcbb162e5a75e17f00891b04199
Trello: https://trello.com/c/JN6xUY79
Validator for image_id

Add validator that checks image with specified image_id exists.

Change-Id: I1ea83ae18f5b365ebe8d6da765b544138aebdac4
Temporary fix testtols version to unblock gate

Gate is broken now due to the bug 1274056

Change-Id: I72e1192263d90c4f1aaf794b332b69d35c3889e8
Merge "Move cleanup functions to benchmark.utils"
Merge "Validator for image_id"
Merge "Call rally-manage with warning when openstack-rally-manage is used"
Validator for flavor_id

Add validator that checks flavor with specified flavor_id exists.

Change-Id: Iaaefb1f5d5a29f6b9e8a316ed6d96b334da602ec
configurable poll delay

Change-Id: I7ddf6244ab87e748bb2daf6502db56df13034168