Disable useless-suppression in webserver_sub_ssl.

Seems like this pylint bug doesn't happen on all systems...

tests/integration/webserver_sub_ssl.py

@@ -55,7 +55,8 @@ def main():
     ssl_dir = os.path.join(os.path.abspath(os.path.dirname(__file__)),
                            'data', 'ssl')
     # WORKAROUND for https://github.com/PyCQA/pylint/issues/399
-    context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)  # pylint: disable=no-member
+    # pylint: disable=no-member, useless-suppression
+    context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
     context.load_cert_chain(os.path.join(ssl_dir, 'cert.pem'),
                             os.path.join(ssl_dir, 'key.pem'))
     app.run(port=int(sys.argv[1]), debug=False, ssl_context=context)