Actually changed monitoring level on Jenkins

hack/jenkins/e2e.sh

@@ -305,6 +305,7 @@ export KUBE_GKE_NETWORK=${E2E_NETWORK}
 
 # Shared cluster variables
 export E2E_MIN_STARTUP_PODS=${E2E_MIN_STARTUP_PODS:-}
+export KUBE_ENABLE_CLUSTER_MONITORING=${ENABLE_CLUSTER_MONITORING:-}
 export MASTER_SIZE=${MASTER_SIZE:-}
 export MINION_SIZE=${MINION_SIZE:-}
 export NUM_MINIONS=${NUM_MINIONS:-}