修改MantisServiceTest getattachfile相關method
Merge branch 'story_7111_2' of github.com:ezScrum/ezScrum into story_7111_2

Conflicts:
	test/ntut/csie/ezScrum/web/action/report/GetTaskBoardStoryTaskListTest.java
	test/ntut/csie/ezScrum/web/mapper/ProductBacklogMapperTest.java