Fix test_iterlen by returning the iterator of dict views. Problem is that

iteritems and itervalues' previous object were both an iterator *and* and
iterable.  The tests expected an iterator but were given an iterable.

Should the 2to3 conversion for iter(values|items|keys) change the code to
``iter(dict.keys())`` to be more compatible?

BROKEN

     test_bsddb test_bsddb3 test_compile test_dumbdbm
-    test_importhooks test_iter test_iterlen
+    test_importhooks test_iter

Lib/test/test_iterlen.py

@@ -139,14 +139,14 @@ class TestDictItems(TestTemporarilyImmutable):
 
     def setUp(self):
         d = dict.fromkeys(xrange(n))
-        self.it = d.items()
+        self.it = iter(d.items())
         self.mutate = d.popitem
 
 class TestDictValues(TestTemporarilyImmutable):
 
     def setUp(self):
         d = dict.fromkeys(xrange(n))
-        self.it = d.values()
+        self.it = iter(d.values())
         self.mutate = d.popitem
 
 class TestSet(TestTemporarilyImmutable):