Issue #5715: In socketserver, close the server socket in the child process.

diff --cc Misc/NEWS
index 47b9c3248ecebfaed9e574608403a21b50a3c237,fc54f8905af5d3f70ce84d8698af94d168d38efd..8dad4f2d3232479252f993cbdc894a6ad0c4382c
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,9 -10,11 +10,11 @@@ What's New in Python 3.3 Alpha 1
  Core and Builtins
  -----------------
  
 -Library
 --------
 +- Issue #12166: Move implementations of dir() specialized for various types into
 +  the __dir__() methods of those types.
  
+ - Issue #5715: In socketserver, close the server socket in the child process.
+ 
  - Correct lookup of __dir__ on objects. Among other things, this causes errors
    besides AttributeError found on lookup to be propagated.