Move PDB controller and type ownership to SIG-Apps

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.

OWNERS_ALIASES

@@ -64,4 +64,18 @@ aliases:
     - mrhohn
     - dcbw
     - danwinship
-    - caseydavenport
+    - caseydavenport
+  sig-apps-reviewers:
+    - enisoc
+    - erictune
+    - foxish
+    - janetkuo
+    - kargakis
+    - kow3ns
+    - lukaszo
+    - mfojtik
+    - smarterclayton
+    - soltysh
+  sig-apps-api-approvers:
+    - erictune
+    - smarterclayton

pkg/apis/policy/OWNERS

@@ -1,14 +1,4 @@
+approvers:
+- sig-apps-api-approvers
 reviewers:
-- thockin
-- lavalamp
-- smarterclayton
-- deads2k
-- caesarxuchao
-- sttts
-- ncdc
-- timothysc
-- dims
-- mml
-- mbohlool
-- david-mcmahon
-- jianhuiz
+- sig-apps-reviewers

pkg/controller/disruption/OWNERS

@@ -1,5 +1,2 @@
 reviewers:
-- mml
-- davidopp
-- kargakis
-- mwielgus
+- sig-apps-reviewers

staging/src/k8s.io/client-go/pkg/apis/policy/OWNERS

@@ -1,14 +1,4 @@
+approvers:
+- sig-apps-api-approvers
 reviewers:
-- thockin
-- lavalamp
-- smarterclayton
-- deads2k
-- caesarxuchao
-- sttts
-- ncdc
-- timothysc
-- dims
-- mml
-- mbohlool
-- david-mcmahon
-- jianhuiz
+- sig-apps-reviewers