Set libvirt event loop watchers to max priority.

This is a fix when is the same poll we try to update a tag value for a VM and
the domain just has been removed.

cloudcontrol/node/hypervisor/lib.py

@@ -59,7 +59,8 @@ class LoopHandler(object):
         self._events = self.virt_to_ev(events)
         self._cb = cb
         self.opaque = opaque
-        self.watcher = loop.io(self.fd, self._events, self.ev_cb)
+        self.watcher = loop.io(self.fd, self._events, self.ev_cb,
+                               None, pyev.EV_MAXPRI)
 
     def ev_to_virt(self, events):
         """Convert libev events into libvirt one."""
@@ -129,7 +130,7 @@ class LoopTimer(object):
         self.stop()
         if self._interval >= 0.:  # libvirt sends us interval == -1
             self.watcher = self.loop.timer(self._interval, self._interval,
-                                           self.ev_cb)
+                                           self.ev_cb, None, pyev.EV_MAXPRI)
         else:
             self.watcher = None
         self.start()