Test update for previous checkin - sets a datastream as existing when it calls the api directly.
Test update for previous checkin - sets a datastream as existing when it calls the api directly.

git-svn-id: bb2ed31f08aebe2c251d311350391bbcccfc1c3a@653 1168706f-7e1d-44e7-b746-9e172b5a9a2f

emory-libraries/eulcore-history,emory-libraries/eulcore-history