Migrated auth.py, test_auth.py, fake_credentials.py, fake_identity.py,
fake_http.py from tempest, as well as the EndpointNotFound exception.
This migrates the above files from tempest. This latest Change-Ids of each file at
the time of this migration of each fare the following:
* auth.py : If5a889be5826d60bf61dbb84661a5896cb094875
* tests/test_auth.py : Iedcd2fa7713409743b1b4b9f460481608796d491
* tests/fake_credentials.py : If5a889be5826d60bf61dbb84661a5896cb094875
* tests/fake_identity.py : Ie405ba6a71d29258e99d2f0b68afb013a9619e9b
* tests/fake_http.py : I8f14cd2ca6afc38d3fe8ee758272071111022896
to see the commit history for these files refer to the above sha1s in the tempest repository
Change-Id: I073d728a2cbf2f6ddde0a8629cc53eccbe3d6d8f