Switching to the junit4 jars, although the @annotation stuff isn't going to work.  Also switching to the non-junit4 testng jars, to avoid classpath order confusion.

Review at http://gwt-code-reviews.appspot.com/1374801

Review by: jat@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9825 8db76d5a-ed1c-0410-87a9-c151d255dfc7