Expose private_floating_network_interface to stack outputs

The infromation will be used by automation to set correct interface for floating
network.

Related-Prod: PRODX-4286
Change-Id: I4d3df318f1d58b27a647629292d25b50b410ff4b
diff --git a/de/heat-templates/top.yaml b/de/heat-templates/top.yaml
index fa54943..a6fef6a 100644
--- a/de/heat-templates/top.yaml
+++ b/de/heat-templates/top.yaml
@@ -76,6 +76,10 @@
   private_floating_network_gateway:
     type: string
     default: ''
+  private_floating_network_interface:
+    type: string
+    default: 'veth-phy'
+    description: 'The name of interface that should be added to external neutron bridge for floating network.'
   private_floating_interface:
     description: Interface which carries floating network for child OpenStack.
     type: string
@@ -530,6 +534,8 @@
     value: { get_param: private_floating_network_pool_end }
   private_floating_network_gateway:
     value: { get_param: private_floating_network_gateway }
+  private_floating_network_interface:
+    value: { get_param: private_floating_network_interface }
   tunnel_interface:
     value: { get_param: tunnel_interface }
   live_migration_interface: