Tests should no longer use the environment-variable-related-setup and set up in app instead

This should remove a bunch of confusing cruft.  I hate using that
environment variable!  Also that old code was fragile.

This commit sponsored by Stephen Milton.  Thanks!

mediagoblin/init/celery/from_tests.py

@@ -1,33 +0,0 @@
-# GNU MediaGoblin -- federated, autonomous media hosting
-# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-#
-# You should have received a copy of the GNU Affero General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-import os
-
-from mediagoblin.tests.tools import TEST_APP_CONFIG
-from mediagoblin.init.celery.from_celery import setup_self
-
-
-OUR_MODULENAME = __name__
-CELERY_SETUP = False
-
-
-if os.environ.get('CELERY_CONFIG_MODULE') == OUR_MODULENAME:
-    if CELERY_SETUP:
-        pass
-    else:
-        setup_self(check_environ_for_conf=False, module_name=OUR_MODULENAME,
-                   default_conf_file=TEST_APP_CONFIG)
-        CELERY_SETUP = True