Add a test targeting bugzilla bug 1102120

Add a test which issues an HTTP GET request to the base content view filters
path. Assert that the response is an HTTP 400 (bad request) or 422
(unprocessable entity) message.
Skip known-failing tests

Creating a role with a name containing non-ascii characters is known to fail.
Update a `skip_if_bug_open` decorator to make tests which target this issue
skip.
Merge pull request #1272 from Ichimonji10/jenkins

Skip known-failing tests
Merge pull request #1271 from Ichimonji10/bz-1102120

Add a test targeting bugzilla bug 1102120