Set self.sename to sename after calling semanage_seuser_set_sename()

This fixes audit information that are being logged and a crash when the
python-audit binding is not installed.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=734806

policycoreutils/semanage/seobject.py

@@ -575,6 +575,7 @@ class loginRecords(semanageRecords):
 
 		if sename != "":
 			semanage_seuser_set_sename(self.sh, u, sename)
+                        self.sename = sename
 		else:
 			self.sename = self.oldsename