Fix influxdb e2e test failure.

In scalability testing influxdb was recently disabled, but we still
trying to execute corresponidng test, as a result it fails all the time.
Skip test if influxdb is disabled.

hack/ginkgo-e2e.sh

@@ -148,6 +148,7 @@ export PATH=$(dirname "${e2e_test}"):"${PATH}"
   --network="${KUBE_GCE_NETWORK:-${KUBE_GKE_NETWORK:-e2e}}" \
   --node-tag="${NODE_TAG:-}" \
   --master-tag="${MASTER_TAG:-}" \
+  --cluster-monitoring-mode="${KUBE_ENABLE_CLUSTER_MONITORING:-influxdb}" \
   ${KUBE_CONTAINER_RUNTIME:+"--container-runtime=${KUBE_CONTAINER_RUNTIME}"} \
   ${MASTER_OS_DISTRIBUTION:+"--master-os-distro=${MASTER_OS_DISTRIBUTION}"} \
   ${NODE_OS_DISTRIBUTION:+"--node-os-distro=${NODE_OS_DISTRIBUTION}"} \