Fix python3 simple cache test failures

Minor differences in format/% and lists-as-views fixes.

src/saml2/cache.py

@@ -96,7 +96,7 @@ class Cache(object):
         cni = code(name_id)
         (timestamp, info) = self._db[cni][entity_id]
         if check_not_on_or_after and time_util.after(timestamp):
-            raise ToOld("past %s" % timestamp)
+            raise ToOld("past %s" % str(timestamp))
 
         return info or None
 

tests/test_32_cache.py

@@ -35,7 +35,7 @@ class TestClass:
                         
         (ava, inactive) = self.cache.get_identity(nid[0])
         assert inactive == []
-        assert ava.keys() == ["givenName"]
+        assert list(ava.keys()) == ["givenName"]
         assert ava["givenName"] == ["Derek"]
         
     def test_add_ava_info(self):