message: [test] functional framework: add CScript hex() for Python 3.4
  test/functional/wallet_importmulti.py failed with:
  AttributeError: 'CScript' object has no attribute 'hex'
diff: @@ -450,6 +450,10 @@ class CScript(bytes):
  # join makes no sense for a CScript()
  raise NotImplementedError
  + # Python 3.4 compatibility
  + def hex(self):
  + return hexlify(self).decode('ascii')
  +
  def __new__(cls, value=b''):
  if isinstance(value, bytes) or isinstance(value, bytearray):
  return super(CScript, cls).__new__(cls, value)
  