Add triggers for codesniffer phpunit

This requires the job to be added to jjbc in
I30bc4ac658d8933790ff4304351f1b2d9c5a3218

The tests that this trigger will be added in
I875b366b5bb273323a5faedcd65f1c2978a33d70

As far as I can tell phpunit should find the
phpunit.xml.dist and run the jobs straight away

Change-Id: I336e0e917f4b8a78ffcd77bd29ae0fa759416adb