Standalone: Disable persisting VIPs on /etc/hosts

This adds the needed parameter to the standalone environment file.

Change-Id: I9c7151b0085cd2d341e17f78dc75d1781cb7ae9d
Related-Bug: #1799724

environments/standalone/standalone-tripleo.yaml

@@ -24,6 +24,10 @@
 #   
 #   openstack overcloud roles generate -o ~/roles_data.yaml Standalone
 parameter_defaults:
+  # Set to true to append per network Vips to /etc/hosts on each node.
+  # Type: string
+  AddVipsToEtcHosts: False
+
   # DNS servers to use for the Overcloud (2 max for some implementations). If not set the nameservers configured in the ctlplane subnet's dns_nameservers attribute will be used.
   # Type: comma_delimited_list
   DnsServers: []

sample-env-generator/standalone.yaml

@@ -43,6 +43,9 @@ environments:
       puppet/all-nodes-config.yaml:
         parameters:
           - StackAction
+      sample-env-generator/standalone.yaml:
+        parameters:
+          - AddVipsToEtcHosts
     sample_values:
       StackAction: CREATE
       SoftwareConfigTransport: POLL_SERVER_HEAT
@@ -265,4 +268,8 @@ parameters:
     default: standalone
     description: Name of the flavor for Standalone nodes
     type: string
-
+  AddVipsToEtcHosts:
+    default: false
+    description: >
+      Set to true to append per network Vips to /etc/hosts on each node.
+    type: string