Unhardcode dns_nameservers

Related-Prod: PRODX-3456
Change-Id: Ic18703a639bb3c5b07987a4084d4aa3acc7bffe7
diff --git a/de/heat-templates/top.yaml b/de/heat-templates/top.yaml
index 4d472c1..c1f27ad 100644
--- a/de/heat-templates/top.yaml
+++ b/de/heat-templates/top.yaml
@@ -10,6 +10,9 @@
     description: >
       ID of public network for which floating IP addresses will be allocated/
       for baremetal case flat provision network for nodes
+  dns_nameservers:
+    type: json
+    default: []
   control_network_cidr:
     type: string
     description: The CIDR of control network, used to detect control interface.
@@ -326,6 +329,7 @@
     properties:
       public_net_id: { get_param: public_net_id }
       control_network_cidr: { get_param: control_network_cidr }
+      dns_nameservers: { get_param: dns_nameservers }
 
   tun_network:
     type: MCP2::NetworkTun