RestApiServlet: Flush pending padding as well This issue was found by scan.coverity.com (CID 19911) which is a static code analysis tool, free for open source code. Originally it was classified as a resource leak, but this is a miss classification as the auto closing of the OutputStream will flush any pending padding. Change-Id: I4dc2d1cd9f52740490fda7c37e98b115fa59ec3a