Updated openstack/openstack
Project: openstack/keystone  30adb5e470676d2a61e996f9a6b551eaf8a22d83

Remove unused variable TIME_FORMAT

The keystone.tests.test_backend.TIME_FORMAT variable is not used, so
remove it.

Change-Id: Ia86f31a10a6220388a6ba622764a7928d75671cf