agent: use instance.short_hostname in send_init_commands()

closes #263

circle/vm/models/instance.py

@@ -613,6 +613,13 @@ class Instance(AclBase, VirtualMachineDescModel, StatusModel, OperatedMixin,
         except:
             return
 
+    @property
+    def short_hostname(self):
+        try:
+            return self.primary_host.hostname
+        except AttributeError:
+            return self.vm_name
+
     def get_vm_desc(self):
         """Serialize Instance object to vmdriver.
         """

circle/vm/tasks/local_agent_tasks.py

@@ -46,7 +46,7 @@ def send_init_commands(instance, act):
     with act.sub_activity('set_hostname',
                           readable_name=ugettext_noop('set hostname')):
         set_hostname.apply_async(
-            queue=queue, args=(vm, instance.primary_host.hostname))
+            queue=queue, args=(vm, instance.short_hostname))
 
 
 def send_networking_commands(instance, act):