Switch the Nagios dashboard to the public network

By default, the Nagios dashboard is now exposed on the public network.
To change this configuration, the deployer will have to assign the
'infrastructure_alerting_ui' role to another network using Fuel netwowrk
templates.

DocImpact

Change-Id: I2e6bf12dc530af18a048c61adbb8da07c1156810

network_roles.yaml

@@ -4,7 +4,6 @@
 # This split will help to enable HTTPS for the Nagios UI and deploy it on
 # another network while LMA collectors continue to use HTTP over the
 # "monitoring" network.
-
 - id: "infrastructure_alerting"
   default_mapping: "management"
   properties:
@@ -19,7 +18,7 @@
            - "infrastructure_alerting"
 
 - id: "infrastructure_alerting_ui"
-  default_mapping: "management"
+  default_mapping: "public"
   properties:
     subnet: true
     gateway: false

node_roles.yaml

@@ -2,7 +2,8 @@ infrastructure_alerting:
   name: 'StackLight Infrastructure Alerting'
   description: 'Install services for the infrastructure alerting'
   has_primary: true
-  public_ip_required: false
+  # A public IP address is required when Nagios is deployed on the public network
+  public_ip_required: true
   weight: 100
   limits:
     max: 3