[TEST] Fixed ActionNamesTests to not use random action names that conflict with existing ones

ActionNamesTests#testIncomingAction rarely uses a random action name to make sure that actions registered via plugins work properly. In some cases the random action would conflict with existing one (e.g. tv) and make the test fail. Fixed also testOutgoingAction although the probability of conflict there is way lower due to longer action names used from 1.4 on.