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/scripts/base_edgeconfig.yaml b/scripts/base_edgeconfig.yaml
index fcd1a23..e98a648 100644
--- a/scripts/base_edgeconfig.yaml
+++ b/scripts/base_edgeconfig.yaml
@@ -3,6 +3,8 @@
 
 netprep_nat_if: "eno1"
 netprep_internal_if: "eno2"
+netprep_router: true
+netprep_netplan_file: "02-pronto"
 
 tftpd_files:
   - "undionly.kpxe"