OPENJPA-2444 move the cleanup after freeing the InputStream

Win* blocks the whole file as long as the InputStream is not closed.
Thus we can only delete the file afterwards.



git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.3.x@1536462 13f79535-47bb-0310-9956-ffa450edef68