Remove unused DEFAULT_DOMAIN variable

The keystone.identity.backends.ldap.DEFAULT_DOMAIN
variable wasn't used.

The keystone.assignment.backends.ldap.DEFAULT_DOMAIN
was used, but should not have been, because we've
got a keystone.assignment.core.DEFAULT_DOMAIN.

Change-Id: I0f4bb0bd953a9ced8c3dfc46ea44ff0e377db082
Update my mailmap

Using new email adress.

Change-Id: Ib1b1be0fe7bba90a9cb2d401a82417b5008add44
Remove duplicated code on test_v3_auth

Try to be a bit more DRYer in the external authentication testing part.

Change-Id: I295a952fabf923d084daee14a154cb6ac5b7838b
Adds fixture package from oslo

The mock library is added to test-requirements.txt since the
mockpatch fixture requires it.

Change-Id: I1b5b0c75f256382a685fceb2117db6d5b18d8c4f
Uses fixtures for mox and stubs

Fixtures use the much more reliable addCleanup instead of the tearDown.
They also allow us the only use fixtures in test classes that use then
instead of having the overhead for every test class.

Change-Id: Ifca4ecce0d66932282334d3e4db6d10a2921dbbb
proxy removed from identity and changed to assignment

The identity_api served as a proxy for calling the assignment_api
but it was suggested that this proxy should be removed and the calls
should be made directly to the assignment_api.

bug: #1220913

Change-Id: I20c461c06db22c03eb6d16399d1ca50999d053d5
Merge "Adds fixture package from oslo"
Merge "proxy removed from identity and changed to assignment"
Merge "Uses fixtures for mox and stubs"
Merge "Remove unused DEFAULT_DOMAIN variable"
Merge "Update my mailmap"
Merge "Remove duplicated code on test_v3_auth"