Update OWNERS, OWNERS_ALIASES and SECURITY_CONTACTS

Author: Bob Killen

OWNERS

@@ -1,6 +1,7 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-  # TODO: in your repo created from this template, you should replace the
-  # steering-committee with a list of project owners, see the doc linked above.
-  - steering-committee
+  - chuckha
+  - cluster-api-admins
+  - cluster-api-maintainers
+  - sig-cluster-lifecycle-leads

OWNERS_ALIASES

@@ -1,20 +1,15 @@
 # See the OWNERS docs at https://go.k8s.io/owners#owners_aliases
 
 aliases:
-  # TODO: remove this alias, it will go stale in your repo, and in your repo
-  # you should have your own set of approvers (see OWNERS)
-  # in the original template repo, we must maintain this list to approve changes
-  # to the template itself
-  steering-committee:
-    - bgrant0607
-    - brendandburns
-    - derekwaynecarr
-    - dims
-    - jbeda
-    - michelleN
-    - philips
-    - pwittrock
-    - sarahnovotny
-    - smarterclayton
-    - spiffxp
+  sig-cluster-lifecycle-leads:
+    - luxas
+    - justinsb
     - timothysc
+  cluster-api-admins:
+    - justinsb
+    - detiber
+    - davidewatson
+  cluster-api-maintainers:
+    - justinsb
+    - detiber
+    - vincepri

SECURITY_CONTACTS

@@ -10,5 +10,7 @@
 # DO NOT REPORT SECURITY VULNERABILITIES DIRECTLY TO THESE NAMES, FOLLOW THE
 # INSTRUCTIONS AT https://kubernetes.io/security/
 
-bob
-alice
+detiber
+justinsb
+luxas
+timothysc