Fix proxy addresses for Kibana and Grafana

https://github.com/Mirantis/mk-lab-salt-model/pull/161
diff --git a/nginx/server/proxy/grafana_web.yml b/nginx/server/proxy/grafana_web.yml
index 7ad1af0..a1c7c49 100644
--- a/nginx/server/proxy/grafana_web.yml
+++ b/nginx/server/proxy/grafana_web.yml
@@ -8,7 +8,7 @@
           type: nginx_proxy
           name: grafana
           proxy:
-            host: mon
+            host: ${_param:stacklight_monitor_address}
             port: 3000
             protocol: http
           host:
diff --git a/nginx/server/proxy/kibana_web.yml b/nginx/server/proxy/kibana_web.yml
index b83ae25..1120c9c 100644
--- a/nginx/server/proxy/kibana_web.yml
+++ b/nginx/server/proxy/kibana_web.yml
@@ -8,7 +8,7 @@
           type: nginx_proxy
           name: kibana
           proxy:
-            host: mon01
+            host: ${_param:stacklight_monitor_address}
             port: 5601
             protocol: http
           host: