Fix trust test cases for redelegation and add test for impersonation

[Jorge Munoz]

Test under class TestTrustRedelegation in test_v3_auth.py do not test redelegation since trust are created with impersonation set to true. Also, no test class exist for testing impersonation.

Incorrect boolean value: https://github.com/openstack/keystone/blob/1e44004c4028bd314ea59a084d4c898e2815c9de/keystone/tests/unit/test_v3_auth.py#L2931

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/273232

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/273279

[OpenStack Infra (hudson-openstack)]

Change abandoned by Jorge Munoz (<email address hidden>) on branch: master
Review: https://review.openstack.org/273232
Reason: Correct behavior

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/278163

[Steve Martinelli (stevemar)]

not critical to mitaka3

[OpenStack Infra (hudson-openstack)]

Change abandoned by Jorge Munoz (<email address hidden>) on branch: master
Review: https://review.openstack.org/273279
Reason: In favor of: https://review.openstack.org/#/c/278163/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/278163
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=9ae8795643acb4612dd13c60ce29b15081c39b8d
Submitter: Jenkins
Branch: master

commit 9ae8795643acb4612dd13c60ce29b15081c39b8d
Author: Jorge Munoz <email address hidden>
Date: Wed Feb 10 00:29:00 2016 +0000

    Fix trust chain tests

    Since redelegation of trust is only allowed using impersonation,
    test under class TestTrustChain need to test redelegation with
    impersonation set true.

    Change-Id: Ifba25568e2b55df895377a3b1c9626844b735a7c
    Partial-Bug: 1538626

[Steve Martinelli (stevemar)]

i'm going to mark this as fix released since the patch merged. not sure why it is a partial fix.