remove hack, ApplicationWorker now calls validate_config by default
remove hack, ApplicationWorker now calls validate_config by default

harrissoerja/vumi,vishwaprakashmishra/xmatrix,vishwaprakashmishra/xmatrix,vishwaprakashmishra/xmatrix,TouK/vumi,harrissoerja/vumi,TouK/vumi,harrissoerja/vumi,TouK/vumi