Add neutron client definition for public network

Allow to create public network via reclass neutron.client
Fix binding for bind9 service to listen on single_address instead
of 127.0.0.1

Related-Prod: OSCORE-270

Co-Autored-By: mkarpin <mkarpin@mirantis.com>
Change-Id: I66467801f87b17dca180c71fd2c690e0818581f3
diff --git a/designate/server/backend/bind.yml b/designate/server/backend/bind.yml
index 5836f24..4201f60 100644
--- a/designate/server/backend/bind.yml
+++ b/designate/server/backend/bind.yml
@@ -21,7 +21,7 @@
         local:
           enabled: true
           bind:
-            address: 127.0.0.1
+            address: ${_param:single_address}
             port: 953
           allow:
             - 127.0.0.1
@@ -32,7 +32,7 @@
       enabled: true
       option:
         default:
-          server: 127.0.0.1
+          server: ${_param:single_address}
           port: 953
           key: designate
       key: