Merge pull request #2849 from k8s-infra-cherrypick-robot/cherry-pick-2847-to-release-0.12

[release-0.12] 🌱 Add bnallapeta to reviewers

Author: k8s-ci-robot

OWNERS_ALIASES

@@ -22,4 +22,5 @@ aliases:
     - emilienm
     - lentzi90
   cluster-api-openstack-reviewers:
+    - bnallapeta
     - smoshiur1237