[test] pull yapps from Logilab's github
Fixes a couple of failures, pull request is almost a year old
(https://github.com/smurfix/yapps/pull/2).
ifnotrql('CWConstraintType X WHERE X name "RQLUniqueConstraint"',ask_confirm=False):rql('INSERT CWConstraintType X: X name "RQLUniqueConstraint"',ask_confirm=False)