Scenario test for Start and Stop web job
Merge branch 'StartStopJobTest' into release-0.7.3
Merge pull request #2289 from yugangw-msft/JobSceanrioTest

Sceanrio test for start & stop web job
(Note: the merge build failure was caused by the Jenkins internal error which has happened since PR 772. Since mine is test specific change, with low risk. So I went ahead and check in