Flush all dbs in the live redis helper
Flush all dbs in the live redis helper

server spec uses multiple databases, now need to make sure they're all empty before running specs.

caulfield/fakeredis,alexlag/fakeredis,alienxp03/fakeredis,guilleiguaran/fakeredis,gotwalt/fakeredis,TiteiKo/fakeredis,meetupcall/fakeredis,carsonreinke/fakeredis,hoffmanc/fakeredis,zegal-cn/fakeredis