Give option of using existing or no undercloud floating ip

Likely users will want to use an existing floating IP so that it is
stable for SSH or ansible playbooks. This allows env.yaml to specify an
existing (or no) floating ip.

templates/env.yaml.example

@@ -22,3 +22,16 @@ parameters:
   external_net: external
   public_net_name: public
   provision_net_name: provision
+
+# Uncomment and customize the following to use an existing floating ip
+# parameter_defaults:
+#   undercloud_floating_ip_id: 'uuid of floating ip'
+#   undercloud_floating_ip: 'address of floating ip'
+#
+# resource_registry:
+#   OS::OVB::UndercloudFloating: templates/undercloud-floating-existing.yaml
+
+
+# Uncomment the following to use no floating ip
+# resource_registry:
+#  OS::OVB::UndercloudFloating: templates/undercloud-floating-none.yaml

templates/undercloud-floating-existing.yaml

@@ -0,0 +1,35 @@
+heat_template_version: 2015-04-30
+
+# Template that creates a new floating IP to access the undercloud
+
+parameters:
+  external_net:
+    type: string
+    default: external
+    description: An external network from which floating ips can be provisioned
+
+  undercloud_port:
+    type: string
+    description: Port id of undercloud server for floating ip
+
+  undercloud_floating_ip_id:
+    type: string
+    description: ID of existing floating ip to use.
+
+  undercloud_floating_ip:
+    type: string
+    description: Address of existing floating ip to use.
+    default: ''
+
+resources:
+
+  undercloud_floating_ip_assoc:
+    type: OS::Neutron::FloatingIPAssociation
+    properties:
+      floatingip_id: {get_param: undercloud_floating_ip_id}
+      port_id: {get_param: undercloud_port}
+
+outputs:
+  undercloud_host:
+    value:
+      get_param: undercloud_floating_ip

templates/undercloud-floating-none.yaml

@@ -0,0 +1,17 @@
+heat_template_version: 2015-04-30
+
+# Template that creates a new floating IP to access the undercloud
+
+parameters:
+  external_net:
+    type: string
+    default: external
+    description: An external network from which floating ips can be provisioned
+
+  undercloud_port:
+    type: string
+    description: Port id of undercloud server for floating ip
+
+outputs:
+  undercloud_host:
+    value: 'none'