use names from resources directly (#2135)

jsonnet/kube-prometheus/components/prometheus.libsonnet

@@ -248,11 +248,11 @@ function(params) {
     roleRef: {
       apiGroup: 'rbac.authorization.k8s.io',
       kind: 'Role',
-      name: p._metadata.name + '-config',
+      name: p.roleConfig.metadata.name,
     },
     subjects: [{
       kind: 'ServiceAccount',
-      name: p._metadata.name,
+      name: p.serviceAccount.metadata.name,
       namespace: p._config.namespace,
     }],
   },
@@ -266,11 +266,11 @@ function(params) {
     roleRef: {
       apiGroup: 'rbac.authorization.k8s.io',
       kind: 'ClusterRole',
-      name: p._metadata.name,
+      name: p.clusterRole.metadata.name,
     },
     subjects: [{
       kind: 'ServiceAccount',
-      name: p._metadata.name,
+      name: p.serviceAccount.metadata.name,
       namespace: p._config.namespace,
     }],
   },