zopewsgi: disable XML-RPC and provide an option to enable

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Status Job ID Name Coverage
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passed ERP5.CodingStyleTest-Master

02:57:23

failed ERP5.PerformanceTest-Master

00:34:33

passed SlapOS.Eggs.UnitTest-Master.Python3

00:45:42

failed Wendelin.UnitTest-Master

01:15:24