clean up

qa/rpc-tests/test_framework/comptool.py

@@ -140,13 +140,13 @@ class TestNode(NodeConnCB):
 #    across all connections.  (If outcome of final tx is specified as true
 #    or false, then only the last tx is tested against outcome.)
 
-class TestInstance():
+class TestInstance(object):
     def __init__(self, objects=None, sync_every_block=True, sync_every_tx=False):
         self.blocks_and_transactions = objects if objects else []
         self.sync_every_block = sync_every_block
         self.sync_every_tx = sync_every_tx
 
-class TestManager():
+class TestManager(object):
 
     def __init__(self, testgen, datadir):
         self.test_generator = testgen