remove opCommunityTopicPlugin dependency in testcases (fixes #3458, BP from #3423)

remove opCommunityTopicPlugin dependency in testcases (fixes #3458, BP from #3423)

(cherry picked from commit 03554f57d9dc2ec7ca3543280210c675ec06046e)

Conflicts:
	test/functional/pc_frontend/communityActionsTest.php