Update host network config format

Corresponding to the following ONOS change:
https://gerrit.onosproject.org/#/c/13914/

Change-Id: I92ce0ee1a0f1244a8b4d99d009937f9b75315de0
diff --git a/trellis/trellis_vlan.json b/trellis/trellis_vlan.json
index f08093b..461c16e 100644
--- a/trellis/trellis_vlan.json
+++ b/trellis/trellis_vlan.json
@@ -152,25 +152,25 @@
         "00:bb:00:00:00:01/None": {
             "basic": {
                 "ips": ["2000::201"],
-                "location": "of:0000000000000204/5"
+                "locations": ["of:0000000000000204/5"]
             }
         },
         "00:bb:00:00:00:02/None": {
             "basic": {
                 "ips": ["2000::202"],
-                "location": "of:0000000000000204/6"
+                "locations": ["of:0000000000000204/6"]
             }
         },
         "00:bb:00:00:00:03/None": {
             "basic": {
                 "ips": ["2000::301"],
-                "location": "of:0000000000000205/5"
+                "locations": ["of:0000000000000205/5"]
             }
         },
         "00:bb:00:00:00:04/None": {
             "basic": {
                 "ips": ["2000::302"],
-                "location": "of:0000000000000205/6"
+                "locations": ["of:0000000000000205/6"]
             }
         }
     },