A trivial fix. login_unconditionally needs to be called with

self.login_unconditionally to avoid  "global name
'login_unconditionally' is not defined"

Signed-off-by: Stefan Berger <stefanb@us.ibm.com>

tools/python/xen/xend/XendAuthSessions.py

@@ -55,7 +55,7 @@ class XendAuthSessions:
         @return: Session UUID
         """
         if self.is_authorized(username, password):
-            return login_unconditionally(username)
+            return self.login_unconditionally(username)
 
         raise XendError("Login failed")