Fix assertRaisesMessage calls on Python 2.7.9/2.7.10.

Review Request #7453 — Created June 24, 2015 and submitted — Latest diff uploaded

Information

Review Board
release-2.0.x
9c427ad...

Reviewers

assertRaisesMessage on Python 2.7.9/2.7.10 has a known bug where it
can't be used as a context manager. This fixes the code to use the
old-style invocation, where a lambda is passed in, allowing the tests to
run again.

Unit tests now pass.