Add test for Invalid Constraint Definitions.

[JSR 303 TCK Result] 152 of 257 (59.14%) Pass with 23 Failures and 7 Errors.

Review at http://gwt-code-reviews.appspot.com/1505806

Review by: rchandia@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10496 8db76d5a-ed1c-0410-87a9-c151d255dfc7