Rename connection class level socket attribute to _sock.

hannosch · hannosch · commit 3588bab32493 · 2016-05-22T14:40:30.000+02:00
This matches the renaming done in 93297cc.
diff --git a/pymysql/connections.py b/pymysql/connections.py
@@ -522,7 +522,7 @@ class Connection(object):
     connect().
     """
 
-    socket = None
+    _sock = None
     _auth_plugin_name = ''
 
     def __init__(self, host=None, user=None, password="",
