capture exc_info early in keyspace meta handling

Resolves an issue where exc_info is being cleared in nosetest context,
causing tests to fail.

cassandra/metadata.py

@@ -1708,9 +1708,9 @@ class SchemaParserV22(_SchemaParser):
             ksm = cls._build_keyspace_metadata_internal(row)
         except Exception:
             name = row["keyspace_name"]
-            log.exception("Error while parsing metadata for keyspace %s row(%s)", name, row)
             ksm = KeyspaceMetadata(name, False, 'UNKNOWN', {})
-            ksm._exc_info = sys.exc_info()
+            ksm._exc_info = sys.exc_info()  # capture exc_info before log because nose (test) logging clears it in certain circumstances
+            log.exception("Error while parsing metadata for keyspace %s row(%s)", name, row)
         return ksm
 
     @staticmethod

tests/integration/standard/test_metadata.py

@@ -1907,7 +1907,6 @@ class BadMetaTest(unittest.TestCase):
         if CASS_SERVER_VERSION < version:
             raise unittest.SkipTest("Requires server version >= %s" % (version,))
 
-    @notcython
     def test_bad_keyspace(self):
         with patch.object(self.parser_class, '_build_keyspace_metadata_internal', side_effect=self.BadMetaException):
             self.cluster.refresh_keyspace_metadata(self.keyspace_name)