fixing the default gateway

Change-Id: I90d213b234ca9a209d3bd2000e394fb75aa7f808
diff --git a/config/onlab_develop_pod.yml b/config/onlab_develop_pod.yml
index 5039245..c1882b0 100644
--- a/config/onlab_develop_pod.yml
+++ b/config/onlab_develop_pod.yml
@@ -25,6 +25,7 @@
   management_ip: '10.6.0.1/24'
   external_ip: '10.90.0.251/16'
   external_iface: 'eth0'
+  external_gw: '10.90.0.1'
   skipTags:
 
 docker: