Validate prefixes on all sets (#6294)
Validate prefixes on all sets (#6294)

This PR fixes a regression introduced in 8eb838bf91bf7d98aa2ba9eac976e78c9530225e
where hashing technique was used on prefixes to get the right set
to perform the operation, this is not correct since prefixes and
their corresponding keys might hash to a different value depending
on the key length.

For prefixes/directories we should look everywhere to support proper
quorum based listing.

Fixes #6293
harshavardhana/minio,harshavardhana/minio,krishnasrinivas/minio,vadmeste/minio,harshavardhana/minio,fwessels/minio,minio/minio,harshavardhana/minio,harshavardhana/minio,aead/minio,aead/minio,harshavardhana/minio,aead/minio,jimjag/minio,jimjag/minio,krishnasrinivas/minio,NitishT/minio,fwessels/minio,NitishT/minio,balamurugana/minio,krisis/minio,krishnasrinivas/minio,jimjag/minio,krisis/minio,jimjag/minio,aead/minio,aead/minio,harshavardhana/minio,fwessels/minio,minio/minio,harshavardhana/minio,donatello/minio,fwessels/minio,aead/minio,aead/minio,NitishT/minio,aead/minio,vadmeste/minio,donatello/minio,krishnasrinivas/minio,balamurugana/minio,NitishT/minio