pylint upstream: Ignore __metaclass__

__metaclass__ is required for all plugins to be able to pass
Automation Hub tests.

setup.cfg

@@ -57,7 +57,7 @@ disable =
     fixme
 
 [pylint.BASIC]
-good-names = ex, i, j, k, Run, _, e, x, dn, cn, ip, os, unicode
+good-names = ex, i, j, k, Run, _, e, x, dn, cn, ip, os, unicode, __metaclass__
 
 [pylint.IMPORTS]
 ignored-modules =