Migrate to Zuul v3

Migrate all functional jobs and gate to zuul v3.

Needed-By: I3bd49416c4d218602cd32f52283c8d424b447a08
Needed-By: I6d48c1a5c54ab6faae4bb87f072cf20eb84efe40
Change-Id: Ic68072eefe2d001930026b9c7d5b9376eaf9ae9a
11 files changed