cluster/test-deploy/aws/OWNERS: Delegate to openshift/installer

The OWNERS file is copied from openshift/installer@d22a9870 (OWNERS:
Promote abhinavdahiya and wking to approvers, 2018-08-02,
openshift/installer#103), which is still current as of
openshift/installer@245fc0f6 (Merge pull request
openshift/installer#168 from crawford/etcd, 2018-08-27).

Copy/pasting into this repo is not very DRY, but this the temporary
approach Steve is requesting [1] while we work out something more
maintainable.

[1]: openshift#1290 (comment)

cluster/test-deploy/aws/.gitignore

@@ -1,6 +1,7 @@
 *
 !.type
 !.gitignore
+!OWNERS
 !vars*.yaml
 !openshift.yaml
 !bootstrap-script.sh

cluster/test-deploy/aws/OWNERS

@@ -0,0 +1,11 @@
+# See the OWNERS docs: https://git.k8s.io/community/contributors/guide/owners.md
+
+approvers:
+  - aaronlevy
+  - abhinavdahiya
+  - crawford
+  - smarterclayton
+  - wking
+  - yifan-gu
+reviewers:
+  - vikramsk