This was deprecated quite some time ago and we should remove it as
part of the next major release.
Also remove a very old Zuul v1 layout.yaml from the test fixtures.
Change-Id: I40030840b71e95f813f028ff31bc3e9b3eac4d6a
Adds support for expressing artifact dependencies between jobs
which may run in different projects.
Change-Id: If8cce8750d296d607841800e4bbf688a24c40e08