Install python-netaddr in dev VM

Change-Id: I993d9a7c97de94d65ea78a3105dab3e03c667392
diff --git a/ansible/roles/common/defaults/main.yml b/ansible/roles/common/defaults/main.yml
index 0393a03..4aa8032 100644
--- a/ansible/roles/common/defaults/main.yml
+++ b/ansible/roles/common/defaults/main.yml
@@ -6,6 +6,7 @@
   - debian-keyring
   - debian-archive-keyring
   - rng-tools
+  - python-netaddr
 
 obsolete_services:
   - puppet