Created OWNERS_ALIASES called sig-apps-reviewers from the union of reviewers in:
 pkg/controller/{cronjob,deployment,daemon,job,replicaset,statefulset}/OWNERS
except removed inactive user bprashanth

Created OWNERS_ALIASES called sig-apps-api-reviewers as the intersection
of sig-apps-reviewers and the approvers from pkg/api/OWNERS.

Used those OWNERS_ALIASES as the reviewers/approvers for the disruption controller,
and API.