message: [tests] Tidy up imports in address.py
  No need to import twice from util.py
diff: @@ -9,10 +9,7 @@ import unittest
  from .script import hash256, hash160, sha256, CScript, OP_0
  from .segwit_addr import encode_segwit_address
  -from .util import hex_str_to_bytes
  -
  -
  -from test_framework.util import assert_equal
  +from .util import assert_equal, hex_str_to_bytes
  ADDRESS_BCRT1_UNSPENDABLE = 'bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj'
  ADDRESS_BCRT1_UNSPENDABLE_DESCRIPTOR = 'addr(bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj)#juyq9d97'
  