Merge pull request #1254 from iJanki/cert_group

Adding /O=system:masters to admin certificate

roles/kubernetes/secrets/files/make-ssl.sh

@@ -85,7 +85,7 @@ if [ -n "$MASTERS" ]; then
         cn="${host%%.*}"
         # admin key
         openssl genrsa -out admin-${host}-key.pem 2048 > /dev/null 2>&1
-        openssl req -new -key admin-${host}-key.pem -out admin-${host}.csr -subj "/CN=kube-admin-${cn}" > /dev/null 2>&1
+        openssl req -new -key admin-${host}-key.pem -out admin-${host}.csr -subj "/CN=kube-admin-${cn}/O=system:masters" > /dev/null 2>&1
         openssl x509 -req -in admin-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out admin-${host}.pem -days 3650 > /dev/null 2>&1
     done
 fi