Add possible fix for Supervisor#1361: fix path which returns str rather than bytes when a network error occurs.

Author: vsajip

supervisor/medusa/asyncore_25.py

@@ -352,7 +352,7 @@ def recv(self, buffer_size):
             # winsock sometimes throws ENOTCONN
             if why.args[0] in [ECONNRESET, ENOTCONN, ESHUTDOWN]:
                 self.handle_close()
-                return ''
+                return b''
             else:
                 raise