change threading.getIdent to a property

This is new in 2.6 so now need to worry about backwards compatibility :)
diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py
index 44c3336..7c3d90b 100644
--- a/Lib/test/test_threading.py
+++ b/Lib/test/test_threading.py
@@ -73,7 +73,7 @@
         for i in range(NUMTASKS):
             t = TestThread("<thread %d>"%i, self, sema, mutex, numrunning)
             threads.append(t)
-            self.failUnlessEqual(t.get_ident(), None)
+            self.failUnlessEqual(t.ident, None)
             self.assert_(re.match('<TestThread\(.*, initial\)>', repr(t)))
             t.start()
 
@@ -82,7 +82,7 @@
         for t in threads:
             t.join(NUMTASKS)
             self.assert_(not t.is_alive())
-            self.failIfEqual(t.get_ident(), 0)
+            self.failIfEqual(t.ident, 0)
             self.assert_(re.match('<TestThread\(.*, \w+ -?\d+\)>', repr(t)))
         if verbose:
             print 'all tasks done'