Add code-owners plugin to check pipeline

This adds the code-owners plugin to the check pipeline.  Alternatively,
this change could be made in the code owners repo itself in the
.zuul.yaml file.

Change-Id: I06175c01292f09c1b4a211d25a253e16568fd82c
Depends-On: https://gerrit-review.googlesource.com/267313
1 file changed
tree: 00f9b7cf26c2d7dbaee726a048035db7a8c3674a
  1. playbooks/
  2. zuul.d/
  3. .gitreview
  4. LICENSE
  5. README