Send host not ComputeNode into uptime RPC call.

Updates the hypervisor uptime API extension to send the
correct hostname to the get_host_uptime in the compute API.

Fixes LP Bug #1035315.
Change-Id: I4840f16bd3c60063e08e2de8313ef5ed3510555e

nova/api/openstack/compute/contrib/hypervisors.py

@@ -197,7 +197,8 @@ def uptime(self, req, id):
 
         # Get the uptime
         try:
-            uptime = self.api.get_host_uptime(context, hyp)
+            host = hyp['service']['host']
+            uptime = self.api.get_host_uptime(context, host)
         except NotImplementedError:
             msg = _("Virt driver does not implement uptime function.")
             raise webob.exc.HTTPNotImplemented(explanation=msg)