Clean up TSDB Redis backend instantiation.
Clean up TSDB Redis backend instantiation.

- Drop the Redis validation message log level to DEBUG.
BuildingLink/sentry,looker/sentry,BuildingLink/sentry,gencer/sentry,jean/sentry,looker/sentry,ifduyue/sentry,mvaled/sentry,BuildingLink/sentry,BuildingLink/sentry,nicholasserra/sentry,zenefits/sentry,beeftornado/sentry,mvaled/sentry,zenefits/sentry,nicholasserra/sentry,JackDanger/sentry,BuildingLink/sentry,daevaorn/sentry,gencer/sentry,zenefits/sentry,nicholasserra/sentry,ifduyue/sentry,daevaorn/sentry,daevaorn/sentry,fotinakis/sentry,gencer/sentry,ifduyue/sentry,mvaled/sentry,ifduyue/sentry,beeftornado/sentry,beeftornado/sentry,mitsuhiko/sentry,jean/sentry,fotinakis/sentry,alexm92/sentry,gencer/sentry,looker/sentry,zenefits/sentry,mvaled/sentry,jean/sentry,fotinakis/sentry,alexm92/sentry,JamesMura/sentry,daevaorn/sentry,JackDanger/sentry,mvaled/sentry,jean/sentry,JamesMura/sentry,looker/sentry,ifduyue/sentry,JamesMura/sentry,JackDanger/sentry,gencer/sentry,mitsuhiko/sentry,mvaled/sentry,looker/sentry,alexm92/sentry,fotinakis/sentry,JamesMura/sentry,JamesMura/sentry,zenefits/sentry,jean/sentry