5ae155a3de
os_inherit extension has been implemented since 2 years ago, and the
API doc[1] also contains it. However os_inherit extension is disabled
on the default. So it is nice to enable the extension for productions,
development and testing.
This patch comes from the discussion[2].
NOTE: This patch removes a test class which tests the enabled os_inherit
because os_inherit becomes enabled on the default.
[1]: http://developer.openstack.org/api-ref-identity-v3-ext.html#identity_v3_OS-INHERIT-ext
[2]: http://lists.openstack.org/pipermail/openstack-dev/2015-December/081822.html
Closes-Bug: 1526660
Change-Id: Ifac71f7415f21c402f6e00c5264e972b0e80388c