httpclient: update to revision 9517a2b56fe9 of httpplus (issue3905)

Includes upstream change "socketutil: force SSLv3 by default, as it is
safer" which should fix issue 3905.

mercurial/httpclient/__init__.py

@@ -622,6 +622,8 b' class HTTPConnection(object):'
                         # TODO: find a way to block on ssl flushing its buffer
                         # similar to selecting on a raw socket.
                         continue
+                    if e[0] == errno.EWOULDBLOCK or e[0] == errno.EAGAIN:
+                        continue
                     elif (e[0] not in (errno.ECONNRESET, errno.EPIPE)
                           and not first):
                         raise

mercurial/httpclient/socketutil.py

@@ -106,7 +106,7 b' else:'
                     else:
                         raise x
 
-    _PROTOCOL_SSLv23 = 2
+    _PROTOCOL_SSLv3 = 1
 
     CERT_NONE = 0
     CERT_OPTIONAL = 1
@@ -118,7 +118,7 b' else:'
     # pylint: disable=W0613,R0913
     def wrap_socket(sock, keyfile=None, certfile=None,
                 server_side=False, cert_reqs=CERT_NONE,
-                ssl_version=_PROTOCOL_SSLv23, ca_certs=None,
+                ssl_version=_PROTOCOL_SSLv3, ca_certs=None,
                 do_handshake_on_connect=True,
                 suppress_ragged_eofs=True):
         """Backport of ssl.wrap_socket from Python 2.6."""