message: Explicity set encoding to for config file of RPC tests
diff: @@ -234,7 +234,7 @@ def initialize_datadir(dirname, n, bitcoinConfDict=None, wallet=None, bins=None)
  defaults = filterUnsupportedParams(defaults)
  file = BITCOIN_CONF
  - with open(os.path.join(datadir, file), 'w') as f:
  + with open(os.path.join(datadir, file), 'w', encoding='utf-8') as f:
  for (key,val) in defaults.items():
  if isinstance(val, NoConfigValue):
  pass
  