Testrunner does not mark tests failed if imports fail

The testrunner test run [1] was marked as success although the tests weren't actually run. It failed with

Traceback (most recent call last):
File "./testrunner", line 326, in <module>
suite = unittest.TestLoader().loadTestsFromName(before_suite_name)
File "/usr/lib/python2.7/unittest/loader.py", line 91, in loadTestsFromName
module = _import_('.'.join(parts_copy))
ImportError: Import by filename is not supported.

Probably due to not finding the configuration file (it was moved into another directory). This should make the build fail, not pass.

[1] http://factory.couchbase.com/job/couchdb-gerrit-views-upr/52/consoleFull