message: fix err for py3
diff: @@ -334,7 +334,7 @@ class Server(object):
  def check_avx(self):
  p = subprocess.Popen(['cat /proc/cpuinfo | grep avx 2>/dev/null'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
  out, err = p.communicate()
  - if err == '' and len(out) > 0:
  + if err == b'' and len(out) > 0:
  return True
  else:
  return False
  @@ -346,6 +346,7 @@ class Server(object):
  avx_flag = True
  self.use_mkl(True)
  mkl_flag = self.mkl_flag
  + print(avx_support)
  if avx_flag:
  if mkl_flag:
  device_version = "cpu-avx-mkl"
  