PYTHON-2505 Use match_hostname from the ssl module

Author: behackett

THIRD-PARTY-NOTICES

@@ -95,57 +95,3 @@ Unicode Standard, and to make copies of this file in any form
 for internal or external distribution as long as this notice
 remains attached.
 
-4) License Notice for ssl_match_hostname.py
--------------------------------------------
-
-Python License (Python-2.0)
-
-Python License, Version 2 (Python-2.0)
-
-PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
---------------------------------------------
-
-1. This LICENSE AGREEMENT is between the Python Software Foundation
-("PSF"), and the Individual or Organization ("Licensee") accessing and
-otherwise using this software ("Python") in source or binary form and
-its associated documentation.
-
-2. Subject to the terms and conditions of this License Agreement, PSF
-hereby grants Licensee a nonexclusive, royalty-free, world-wide
-license to reproduce, analyze, test, perform and/or display publicly,
-prepare derivative works, distribute, and otherwise use Python
-alone or in any derivative version, provided, however, that PSF's
-License Agreement and PSF's notice of copyright, i.e., "Copyright (c)
-2001-2013 Python Software Foundation; All Rights Reserved" are retained in
-Python alone or in any derivative version prepared by Licensee.
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-or incorporates Python or any part thereof, and wants to make
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pymongo/pool.py

@@ -18,6 +18,7 @@
 import ipaddress
 import os
 import platform
+import ssl
 import socket
 import sys
 import threading
@@ -57,8 +58,6 @@
 from pymongo.server_api import _add_to_command
 from pymongo.server_type import SERVER_TYPE
 from pymongo.socket_checker import SocketChecker
-# Always use our backport so we always have support for IP address matching
-from pymongo.ssl_match_hostname import match_hostname
 from pymongo.ssl_support import (
     SSLError as _SSLError,
     HAS_SNI as _HAVE_SNI,
@@ -1017,7 +1016,7 @@ def _configured_socket(address, options):
                 getattr(ssl_context, "check_hostname", False) and
                 options.ssl_match_hostname):
             try:
-                match_hostname(sock.getpeercert(), hostname=host)
+                ssl.match_hostname(sock.getpeercert(), hostname=host)
             except CertificateError:
                 sock.close()
                 raise