[testDBClientAction] Add more tests for getting actions

Tests for the trigger severity condition didn't exist.
[testDBClientAction] Add more tests for getting actions

Add tests for the trigger severity conditions against CMP_EQ.
[IssueSenderManager] Test creating multi threads
[testActionManager] Add more tests for runAction()
[ActionManager] Check ownerUserId of IssueSender action

Only USER_ID_SYSTEM should be acceptable for IssueSender action.
[testActionManager] Set invalid command for test_runIssueSenderAction*()

Because they test only return value, and want to accelerate running
tests by skiping execution.
Merge pull request #256 from project-hatohol/incident-management-6

Add more tests for action & issue sender