Add additional gluster SMEs to approvers, update ansible reviewers

approvers are SMEs on the intent of the change, reviewers to validate
that the ansible change is acceptable

playbooks/openshift-glusterfs/OWNERS

@@ -1,14 +1,13 @@
 # approval == this is a good idea /approve
 approvers:
   - jarrpa
-  - michaelgugino
-  - mtnbikenc
-  - sdodson
-  - vrutkovs
+  - SaravanaStorageNetwork
+  - nixpanic
 # review == this code is good /lgtm
 reviewers:
   - jarrpa
-  - michaelgugino
+  - jstuever
   - mtnbikenc
+  - padillon
   - sdodson
   - vrutkovs

roles/openshift_storage_glusterfs/OWNERS

@@ -1,10 +1,13 @@
 # approval == this is a good idea /approve
 approvers:
   - jarrpa
-  - abutcher
-  - sdodson
+  - SaravanaStorageNetwork
+  - nixpanic
 # review == this code is good /lgtm
 reviewers:
   - jarrpa
-  - abutcher
+  - jstuever
+  - mtnbikenc
+  - padillon
   - sdodson
+  - vrutkovs