Renamed "devices" to "hosts" in the Topology REST API:

 * REST call path rename:
   http://%s:%s/wm/onos/topology/devices ->
   http://%s:%s/wm/onos/topology/hosts

 * Topology output JSON format: renamed field "devices" to "hosts".

OLD:
{
   ...
   "devices": [...],
   ...
}

NEW:
{
   ...
   "hosts": [...],
   ...
}

TODO in (a) separate commit(s):
 * Renaming of "Device/Devices" and "device/devices" in the Java API
 * Renaming of "Device/Devices" and "device/devices" in the backend
   implementation

Change-Id: Ic70bf166f885a1a5ba7d8d33326ff43f84d2c506
diff --git a/src/main/java/net/onrc/onos/core/topology/web/TopologyWebRoutable.java b/src/main/java/net/onrc/onos/core/topology/web/TopologyWebRoutable.java
index 8eb18d4..1f224d2 100644
--- a/src/main/java/net/onrc/onos/core/topology/web/TopologyWebRoutable.java
+++ b/src/main/java/net/onrc/onos/core/topology/web/TopologyWebRoutable.java
@@ -18,7 +18,7 @@
 
         // Topology API
         router.attach("", TopologyResource.class);
-        router.attach("/devices", DevicesResource.class);
+        router.attach("/hosts", DevicesResource.class);
         router.attach("/links", LinksResource.class);
         router.attach("/switches", SwitchesResource.class);