always config interfaces on compute nodes

Change-Id: Ice8cb2970170eaef1d7a4bc8a5c12a53c85d95f6
diff --git a/roles/maas/templates/automation-compose.yml.j2 b/roles/maas/templates/automation-compose.yml.j2
index 825b1c3..4d2400b 100644
--- a/roles/maas/templates/automation-compose.yml.j2
+++ b/roles/maas/templates/automation-compose.yml.j2
@@ -23,7 +23,7 @@
   environment:
     # need to explicitly set the resolver, else go will skip the /etc/hosts file
     - "GODEBUG=netdns=go"
-    - "INTERFACE_CONFIG={{ interface_config }}"
+    - "INTERFACE_CONFIG=1"
     - "PROVISION_PORT=4243"
     - "PROVISION_LISTEN=0.0.0.0"
     - "PROVISION_DEFAULT_ROLE=compute-node"