Fix testfixture internal classes resolution org.eclipse.rap.rwt.testfixture.internal package is not visible. Use org.eclipse.rap.rwt.testfixture as required bundle. Change-Id: I9a0e63512b19ba0ff77f90fdb6aca644ff8d23f1 Signed-off-by: Ivan Furnadjiev <ivan@eclipsesource.com>