Fix old reference to ConfigHolder (tx for review @jerith).
Fix old reference to ConfigHolder (tx for review @jerith).

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