bpo-34630: Skip logging SSL certificate errors by asyncio code (GH-9169)

Lib/asyncio/base_events.py

@@ -62,6 +62,9 @@ _MIN_CANCELLED_TIMER_HANDLES_FRACTION = 0.5
 _FATAL_ERROR_IGNORE = (BrokenPipeError,
                        ConnectionResetError, ConnectionAbortedError)
 
+if ssl is not None:
+    _FATAL_ERROR_IGNORE = _FATAL_ERROR_IGNORE + (ssl.SSLCertVerificationError,)
+
 _HAS_IPv6 = hasattr(socket, 'AF_INET6')
 
 # Maximum timeout passed to select to avoid OS limitations

Misc/NEWS.d/next/Library/2018-09-11-10-00-53.bpo-34630.YbqUS6.rst

+Don't log SSL certificate errors in asyncio code (connection error logging
+is skipped already).