Rename outfiles to zuul- to match rollout

Turns out 99 isn't a good prefix.

Also, remove the move argument now that we're merging with the existing
projects.yaml.

Also, stop running zuul unittests on migration script changes. They are
not relevant.

Change-Id: I10ed8cae64c82ed5afd01bb03a74ffc4fd2d87ee
3 files changed