Great news all!
Some talks at Wikimania got me looking at ALL of the extensions on gerrit, and thus, some things happened!
We now have zuul / jenkins triggers and jobs for unit tests (non voting) on ALL extensions on gerrit (excluding empty repos) https://gerrit.wikimedia.org/r/#/c/152236/
And 272 of the extensions passed first time and thus now have voting jobs https://gerrit.wikimedia.org/r/#/c/152723/
Still a bit of work to be done making the other hundreds of extensions pass as they have a variety of issues but this is in my opinion a great step!
Thanks to Hashar for all of the merges!
Addshore