Clean up StudentFeedbackQuestionSubmissionEditPageAction:
1. moved unregistereduserToHome test into testExecuteAndPostProcess
2. "moved trying to access question not meant for the user "  into testAccessControl
3. Override verifyCannotAccess function for specific verification test
4.Improved code readability
5.added some verification tests
Merge branch 'master' into Issue1961
[1961] Clean up StudentFeedbackQuestionSubmissionEditPageAction

fixes #1961