Add environment variable to allow using real redis during tests.
Add environment variable to allow using real redis during tests.

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