Add prometheus monitoring to reclass

Add:
* glusterfs server volume
* glusterfs client
* ssl keys for kubernetes
* prometheus related formulas
* telegraf system reclass
* prometheus system reclass
* docker swarm network
* docker swarm services:
  - prometheus
  - alertmanager
  - pushgateway
  - grafana

Change-Id: I4a5a60f35f4c96ca41ac2e94f27c7aefbc286cbf
diff --git a/docker/swarm/service/monitoring/prometheus_pushgateway.yml b/docker/swarm/service/monitoring/prometheus_pushgateway.yml
new file mode 100644
index 0000000..7ba37af
--- /dev/null
+++ b/docker/swarm/service/monitoring/prometheus_pushgateway.yml
@@ -0,0 +1,12 @@
+parameters:
+  docker:
+    client:
+      service:
+        prometheus_pushgateway:
+          network: monitoring
+          replica: 2
+          restart:
+            condition: any
+          image: ${_param:docker_image_pushgateway}
+          ports:
+            - 15012:9091