Fix unit tests.

Turns out that if a test module's setup() function fails, tox silently
ignores the failures.

There was a bug where the test storage policies were being ignored by
the container controller, thus causing
test.unit.proxy.test_server.setup() to fail. The bug has been fixed.

Change-Id: I73a6f9ad3b1e2d7198d6a7fc67a0fbfd9116d684