Add missing ssl enums to astroid/brain

astroid's brian_ssl wrapper lacks several enums constructed in the core
ssl module. This eventually affects pylint's ability to parse code which
makes use of these enums:

> example.py:9:6: E1101: Module 'ssl' has no 'VerifyMode' member (no-member)

Adding these enums to brain_ssl fixes the reported issue against pylint.

See also: pylint-dev/pylint#3691

Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>

ChangeLog

@@ -27,6 +27,10 @@ Release date: TBA
   Closes #1282
   Ref #1103
 
+* Adds missing enums from ``ssl`` module
+
+  Closes PyCQA/pylint#3691
+
 What's New in astroid 2.9.4?
 ============================
 Release date: TBA

astroid/brain/brain_ssl.py

@@ -70,6 +70,8 @@ def ssl_transform():
     from _ssl import _OPENSSL_API_VERSION
     from _ssl import PROTOCOL_SSLv23, PROTOCOL_TLSv1, PROTOCOL_TLSv1_1, PROTOCOL_TLSv1_2
     from _ssl import PROTOCOL_TLS, PROTOCOL_TLS_CLIENT, PROTOCOL_TLS_SERVER
+    from _ssl import AlertDescription, SSLErrorNumber, TLSVersion, VerifyMode
+    from _ssl import Options, VerifyFlags
     """
     )