The script in jenkins-job-builder-compare-xml job failed due to git clone
executing a shallow clone:
Cloning into 'project-config'...
fatal: The remote end hung up unexpectedly
fatal: protocol error: bad pack header
This can be fixed by just removing the '/p/' from the url but we would
rather use the zuul-cloner because it can take advantage of the local
git cache on disk thus allowing for more efficient cloning.
Change-Id: I05f1c928a15cf5e791a95a01975e8aba78f4953f