Merge pull request #172 from cschug/upgrade_node_exporter

chore: upgrade Node Exporter 1.5.0 -> 1.7.0

docker-compose/nodeexporter/docker-compose.yaml

@@ -1,7 +1,7 @@
 ---
 services:
   node_exporter:
-    image: quay.io/prometheus/node-exporter:v1.5.0
+    image: quay.io/prometheus/node-exporter:v1.7.0
     container_name: node_exporter
     command: "--path.rootfs=/host"
     pid: host