pym/_emerge/depgrapgh.py: Fix bug 518968

Fixes commit: 1a00ddf5fb089724a127c8dc72d63f10ae72abbf
Author: Alexander Berntsen <bernalex@gentoo.org> (Thu 08 May 2014 08:47:58 AM PDT)
Subject: emerge: Implement "--alert"

self.query was not assigned using the correct UserQuery instance.
self.uq was not used by anything anywhere.  This patch consolidates it to the one initialized instance in 1 line of code.
Original bug reproduced and fixed by: Mike Gilbert <floppym@gentoo.org>
diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index 8177b74..acb1db1 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -520,8 +520,7 @@
 		self._event_loop = (portage._internal_caller and
 			global_event_loop() or EventLoop(main=False))
 
-		self.uq = UserQuery(myopts)
-		self.query = UserQuery.query
+		self.query = UserQuery(myopts).query
 
 	def _load_vdb(self):
 		"""