Cleanup OWNERS files (No Activity in the last year)

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

cluster/addons/cluster-loadbalancing/OWNERS

@@ -1,10 +1,10 @@
 approvers:
   - bowei
-  - rramkumar1
   - mrhohn
   - freehan
 reviewers:
   - bowei
-  - rramkumar1
   - mrhohn
   - freehan
+emeritus_approvers:
+  - rramkumar1

cluster/addons/metadata-agent/OWNERS

@@ -1,10 +1,11 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-  - kawych
   - sig-instrumentation-approvers
   - x13n
 reviewers:
   - sig-instrumentation-reviewers
 labels:
   - sig/instrumentation
+emeritus_approvers:
+  - kawych

cluster/addons/metrics-server/OWNERS

@@ -1,10 +1,11 @@
 # See the OWNERS docs at https://go.k8s.io/owners
 
 approvers:
-  - kawych
   - serathius
   - sig-instrumentation-approvers
 reviewers:
   - sig-instrumentation-reviewers
 labels:
   - sig/instrumentation
+emeritus_approvers:
+  - kawych

cluster/addons/node-problem-detector/OWNERS

@@ -2,7 +2,7 @@
 
 approvers:
   - Random-Liu
-  - wangzhen127
 reviewers:
   - Random-Liu
+emeritus_approvers:
   - wangzhen127

cluster/gce/OWNERS

@@ -3,7 +3,6 @@
 reviewers:
   - bowei
   - cjcullen
-  - vishh
   - mwielgus
   - MaciekPytel
   - yujuhong
@@ -14,7 +13,6 @@ reviewers:
 approvers:
   - bowei
   - cjcullen
-  - vishh
   - mwielgus
   - MaciekPytel
   - yujuhong
@@ -26,6 +24,7 @@ emeritus_approvers:
   - gmarek
   - jingax10
   - jszczepkowski
+  - vishh
 labels:
   - sig/cloud-provider
   - area/provider/gcp