benchmark util 'get_from_manager' improperly handles http response codes

[Valeriy Ponomaryov]

Any operation "wait_for_delete" expects that exception with http code "404" will be raised.

Different python clients return this code with different names of attribute - either "code" or "http_status".

But function "rally/benchmark/utils.py:get_from_manager" does not expect the latter case and raises general exception "exceptions.GetResourceFailure" instead of expected "exceptions.GetResourceNotFound".

It was found with implementation of Manila project benchmarks.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/185018

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/185018
Committed: https://git.openstack.org/cgit/openstack/rally/commit/?id=a5fbbe88ddf195f3273cff4a8c85f8b83877a16d
Submitter: Jenkins
Branch: master

commit a5fbbe88ddf195f3273cff4a8c85f8b83877a16d
Author: Valeriy Ponomaryov <email address hidden>
Date: Fri May 22 16:17:45 2015 +0300

    Handle http response code 404 properly

    Any operation "wait_for_delete" expects that exception with http code "404"
    will be raised.
    Different python clients return this code with different names of attribute -
    either "code" or "http_status".
    But function "rally/benchmark/utils.py:get_from_manager" does not expect
    the latter case and raises general exception "exceptions.GetResourceFailure"
    instead of expected "exceptions.GetResourceNotFound".
    So, fix mentioned function and related unit test that was asserting
    wrong thing.

    Change-Id: I0430ed8a3e9308e8f4a245b4c68e8d7f1f0bd02d
    Closes-Bug: #1457882