dom0/core: rename "Starting" start to "Transient"

This state can also appear at VM shutdown.

dom0/qvm-core/qubes.py

@@ -641,7 +641,7 @@ class QubesVm(object):
                 return "Dying"
             else:
                 if not self.is_fully_usable():
-                    return "Starting"
+                    return "Transient"
                 else:
                     return "Running"
         else:
@@ -661,7 +661,7 @@ class QubesVm(object):
 
     def is_running(self):
         # in terms of Xen and internal logic - starting VM is running
-        if self.get_power_state() in ["Running", "Starting"]:
+        if self.get_power_state() in ["Running", "Transient"]:
             return True
         else:
             return False