Revert "Bug 897414 - Global console listener should also care about exceptions and not only error. r=dhunt"

This reverts commit 0d56067924b93b7734ca365a27f187e6f2c1c0a3.
Add MPL2.0 and TEST_DATA constants to testMetro/testTabs.js. r=hskupin
Bug 899274 - Update test_manifest_and_tests_exclusive.py with correct argument path values. r=hskupin
Bug 905556 - Bump python dependencies for latest mozbase versions and sync setup_development.py script
Bug 898378 - Correctly close the opened context menu in testExpectedEvents.js. r=hskupin
Bug 871441 - Allow select method to handle xul:menulists. r=hskupin
Bug 871441 - Followup to use a DTD entity in testMenuList. r=hskupin
Bug 899137 - Move all testcase data files to mutt/mutt/tests/data. r=hskupin