sslutil: backed out changeset 074bd02352c0 (issue4038)

Python docs are a little unclear, but mpm reports reading the OpenSSL
source code shows that PROTOCOL_SSLv23 allows TLS whereas
PROTOCOL_SSLv3 does not.

mercurial/sslutil.py

@@ -17,8 +17,7 b' try:'
     def ssl_wrap_socket(sock, keyfile, certfile,
                 cert_reqs=ssl.CERT_NONE, ca_certs=None):
         sslsocket = ssl.wrap_socket(sock, keyfile, certfile,
-                cert_reqs=cert_reqs, ca_certs=ca_certs,
-                ssl_version=ssl.PROTOCOL_SSLv3)
+                cert_reqs=cert_reqs, ca_certs=ca_certs)
         # check if wrap_socket failed silently because socket had been closed
         # - see http://bugs.python.org/issue13721
         if not sslsocket.cipher():