Support the custom field for rfc3442 static routes to the edgeconfig script

Run netprep role on compute servers, with a suitable netplan

Change-Id: I3406d39cbdf733d3a0c1c1e8470f30471a278e60
diff --git a/inventory/group_vars/aethercompute.yml b/inventory/group_vars/aethercompute.yml
index b3c0f03..1dc24d9 100644
--- a/inventory/group_vars/aethercompute.yml
+++ b/inventory/group_vars/aethercompute.yml
@@ -1,4 +1,19 @@
 ---
+
+netprep_router: false
+netprep_netplan_file: "01-netcfg"
+
+netprep_netplan:
+  ethernets:
+    eno1:
+      dhcp4: yes
+      dhcp4-overrides:
+        route-metric: 100
+    enp175s0f0:
+      dhcp4: yes
+      dhcp4-overrides:
+        route-metric: 200
+
 userlist:
   - username: terraform
     comment: "ONF Terraform User"