Remove unused imports

Author: Duddino

test/functional/rpc_rawtransaction.py

@@ -19,10 +19,7 @@
     assert_raises_rpc_error,
 )
 from collections import OrderedDict
-from io import BytesIO
 from test_framework.messages import CTransaction, ToHex
-from test_framework.test_framework import PivxTestFramework
-from test_framework.util import *
 
 class multidict(dict):
     """Dictionary that allows duplicate keys.