[testHatoholArmPluginInterface] Remove a needless length check in data_getDefaultPluginPath()

It breaks the test.
[testDBClientConfig] Remove a needless length check in test_isHatoholArmPlugin()

It breaks the test.
[testActionManager] Add missing initialization of DBClientUser in test_checkEventsWithMultipleIncidentSender()
[testActionManager] Wait finishing action in test_checkEventsWithMultipleIncidentSender()
Merge pull request #360 from project-hatohol/fix-broken-test-20140809

Fix broken tests