[ActionManager] Fix a bug that shouldSkipIncidenSender() never returns true
[testActionManager] test_checkEventsWithMultipleIncidentSender()
[testActionManager] Move a test action definition from testActionDef to test_checkEventsWithMultipleIncidentSender()
Merge pull request #344 from project-hatohol/fix-skipping-incident-sender

Fix a bug that multiple incidents can be created for one event