clean up StudentFeedbackQuestionSubmitPageUiTest
redo clean up StudentFeedbackQuestionSubmitPageUiTest
1.add a textArea getter in FeedbackQuestionSubmitPage
2.substitute direct access to web element with getter function in FeedbackQuestionSubmitPage object
remove unused package
modify indentation for studentFeedbackQuestionSubmitPageUiTest.java
Merge branch 'master' into Issue2164
[2164] clean up StudentFeedbackQuestionSubmitPageUiTest

fixes #2164