assignment fails for ldap get_user

[Sahdev Zala]

Seems like a bug associated with a recent implementation of assignment.

  File "/opt/stack/keystone/tests/_ldap_livetest.py", line 119, in test_ldap_dereferencing
    user_ref = self.identity_api.get_user('alt_fake1')
  File "/opt/stack/keystone/keystone/identity/backends/ldap.py", line 85, in get_user
    return self.assignment._set_default_domain(ref)
AttributeError: 'Identity' object has no attribute 'assignment'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/37561

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/37962
Committed: http://github.com/openstack/keystone/commit/639d62cdbacbe3c3da5183137d900d82bea5389d
Submitter: Jenkins
Branch: master

commit 639d62cdbacbe3c3da5183137d900d82bea5389d
Author: Brant Knudson <email address hidden>
Date: Fri Jul 19 15:10:51 2013 -0500

    Use assignment_api rather than assignment

    When normal dependency injection is used the variables
    are named like "xxx_api".
    This change makes it so that the identity backend and
    drivers use "assignment_api" rather than "assignment"
    so it will be easier to switch to normal dependency
    injection.

    Part of fix for bug 1200769

    Change-Id: I7805b338c48d57ca1922bb622a3f474f2341f4ac

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/37821
Committed: http://github.com/openstack/keystone/commit/3268a4b96449647faa76e5521660516fbc9e8a84
Submitter: Jenkins
Branch: master

commit 3268a4b96449647faa76e5521660516fbc9e8a84
Author: Brant Knudson <email address hidden>
Date: Fri Jul 19 17:11:43 2013 -0500

    Use dependency injection for assignment and identity

    The assignment and identity backends don't use normal
    dependency injection because of a circular reference.

    Support for circular references was added, so these
    backends can now use normal dependency injection.

    Fixes: bug 1200769
    Fixes: bug 1204605

    Change-Id: I8716a65b984c26fcaaf2595463db09e1f02cb475