Fix unit test failures for WebAPITokens due to model conflicts.
Review Request #8280 — Created July 11, 2016 and submitted
When running the entire test suite for Djblets, we'd see errors with certain field accesses on BaseWebAPIToken subclasses. This was due to the Django model metaclass machinery causing issues when two models shared the same name. To solve this, we're doing what all other test models do: Giving them their own unique names. This results in all the unit tests passing.
Unit tests pass.