Fix ranges creation, for multipe similar subnets

Change-Id: I7a0e2146da3e5c2fec3a7934a8c472eec74758ef
diff --git a/maas/region.sls b/maas/region.sls
index 0f82cd8..e795585 100644
--- a/maas/region.sls
+++ b/maas/region.sls
@@ -345,6 +345,7 @@
   - type_range: {{ iprange.type }}
   - start_ip: {{ iprange.start }}
   - end_ip: {{ iprange.end }}
+  - subnet: {{ iprange.get('subnet', '' ) }}
   - comment: {{ iprange.get('comment', "") }}
   - require:
     - maas_create_subnet_{{ subnet.cidr }}