pkg/cli/admin/upgrade: Delegate to update-approvers

This subcommand interacts with the cluster-version operator, which is
now maintained by the updates team.  I'm seeding the alias with the
content from [1].  I've left the 'component' property (added to the
root OWNERS in e83f2ac, Add BZ component name to OWNERS,
2020-04-03, openshift#367) off for now, because the tooling around that only
consumes entries at the repo level.

I think that the admin/release should also be maintained by the
updates team, because it manages the release images for which the CVO
is the sole consumer.  But Scott wants to punt on that for now.

[1]: https://github.com/openshift/cluster-version-operator/blob/914467c03b5bc25dbe4c9295c420fdb2598db821/OWNERS

OWNERS_ALIASES

@@ -0,0 +1,11 @@
+# See the OWNERS_ALIASES docs: https://git.k8s.io/community/contributors/guide/owners.md#OWNERS_ALIASES
+
+aliases:
+  update-approvers:
+    - abhinavdahiya
+    - crawford
+    - jottofar
+    - sdodson
+    - smarterclayton
+    - vrutkovs
+    - wking

pkg/cli/admin/upgrade/OWNERS

@@ -0,0 +1,5 @@
+# See the OWNERS docs: https://git.k8s.io/community/contributors/guide/owners.md
+# This file just uses aliases defined in OWNERS_ALIASES.
+
+approvers:
+  - update-approvers