Update the API test suite for Djblets's new testing framework.

Review Request #7490 — Created July 4, 2015 and submitted — Latest diff uploaded

Information

Review Board
master
f6e92d2...

Reviewers

The bulk of our API testcase has been moved into Djblets. This updates
the Review Board test suite to make use of it, simplifying the code
here.

All unit tests pass.