Zuul no longer requires the project-name for in-repo configuration.
Omitting it makes forking or renaming projects easier.
Change-Id: Ib3be82015be1d6853c44cf53faacb238237ad701
This patch does step 1 in the docs: Move Legacy Jobs to Projects.
Partial-Implements: blueprint migrate-to-zuulv3
Change-Id: I0c0713260c2dfa2ba64a5746c342db01c1bc3d75