Non-admin token tests for Keystone API

Adds non-admin token tests for Keystone/identity API. Work in
support of adding Defcore/interop capabilities for identity.

Currently only supports get token for v2 and v3.

Depends-On: I06fd043e1b31ae0e5e33f4dcf898fb58f2907267
Change-Id: I2134e5694fdbab13b4b19205ecba5711dbac0c25
5 files changed