[~TASK] FLOW3 (Cache): Clean up the RedisBackend
[~TASK] FLOW3 (Cache): Clean up the RedisBackend

Some comments and a useless method have been removed, the exception
lines have been compacted and an incorrect author line was dumped.

Relates to: #9017
Change-Id: I52866d669ce746f53ae705ab10e51da40566658e
Original-Commit-Hash: dd78aca101a46f41bbbc3376b2524ff0885e91f6

dlubitz/flow-development-collection,fcool/flow-development-collection,neos/flow-development-collection,fcool/flow-development-collection,gerhard-boden/flow-development-collection,daniellienert/flow-development-collection,kitsunet/flow-development-collection,robertlemke/flow-development-collection,dfeyer/flow-development-collection,gerhard-boden/flow-development-collection,mkeitsch/flow-development-collection,dfeyer/flow-development-collection,neos/flow-development-collection,bwaidelich/flow-development-collection,dfeyer/flow-development-collection,mkeitsch/flow-development-collection,kdambekalns/flow-development-collection,neos/flow-development-collection,bwaidelich/flow-development-collection,dlubitz/flow-development-collection,robertlemke/flow-development-collection,fcool/flow-development-collection,kdambekalns/flow-development-collection,robertlemke/flow-development-collection,kitsunet/flow-development-collection,kdambekalns/flow-development-collection,dlubitz/flow-development-collection,chewbakartik/flow-development-collection,kdambekalns/flow-development-collection,neos/flow-development-collection,dfeyer/flow-development-collection,aertmann/flow-development-collection,daniellienert/flow-development-collection,albe/flow-development-collection,gerhard-boden/flow-development-collection,aertmann/flow-development-collection,albe/flow-development-collection,bwaidelich/flow-development-collection,daniellienert/flow-development-collection,chewbakartik/flow-development-collection,aertmann/flow-development-collection,albe/flow-development-collection,robertlemke/flow-development-collection,fcool/flow-development-collection,chewbakartik/flow-development-collection,mkeitsch/flow-development-collection,kitsunet/flow-development-collection