Comment 2 for bug 1414083

Reviewed: https://review.openstack.org/150804
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=5f3f379422053829a406c80b291fcbe37c970075
Submitter: Jenkins
Branch: master

commit 5f3f379422053829a406c80b291fcbe37c970075
Author: Pavlo Shchelokovskyy <email address hidden>
Date: Fri Jan 23 19:03:23 2015 +0200

    Enable some unit tests back

    Since split between AWS and OS WaitConidtion/Volume resources unit tests
    for those resources were not running as they were not discovered.

    During this time some changes were merged that actually broke some
    tests (mostly the mocking) so this patch fixes those broken tests too.

    Some AWS WaitConidtion tests were testing the handle_update method,
    which has no sense now as it no longer returns a TaskRunner instance.
    These tests were modified to use the general resource.update method.

    One test in AWS volumes is modified to use mocked ServerConstraint,
    which is added to base TestCase as are stubs for other constraints.
    Another test in AWS volumes was using a dumb monkey-patching
    instead of proper mock, leading to clashes during concurrent test runs.

    Change-Id: Ie765eab75de835d5dec94024f1d90197f1723b4d
    Closes-Bug: #1414083