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
diff --git a/.zuul.yaml b/.zuul.yaml
index b6612ae..2b4c49a 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -45,10 +45,19 @@
       jobs:
         - build-openstack-infra-sphinx-docs:
             success-url: 'html/feature/zuulv3/'
+            irrelevant-files:
+              - zuul/cmd/migrate.py
+              - playbooks/zuul-migrate.yaml
         - tox-cover:
+            irrelevant-files:
+              - zuul/cmd/migrate.py
+              - playbooks/zuul-migrate.yaml
             voting: false
         - tox-pep8
-        - tox-py35
+        - tox-py35:
+            irrelevant-files:
+              - zuul/cmd/migrate.py
+              - playbooks/zuul-migrate.yaml
         - zuul-stream-functional
         - zuul-migrate:
             files:
@@ -59,7 +68,10 @@
         - build-openstack-infra-sphinx-docs:
             success-url: 'html/feature/zuulv3/'
         - tox-pep8
-        - tox-py35
+        - tox-py35:
+            irrelevant-files:
+              - zuul/cmd/migrate.py
+              - playbooks/zuul-migrate.yaml
         - zuul-stream-functional
     post:
       jobs: