S3 Driver: added comment for missing KeyCount workaround
S3 Driver: added comment for missing KeyCount workaround

Signed-off-by: Thomas Berger <a5b23f338648cb6f21e2cc1284e4d1b7b930ac97@lokis-chaos.de>

docker/distribution,sergeyfd/distribution,docker/distribution,sadlil/distribution,sergeyfd/distribution,thaJeztah/distribution,sadlil/distribution,thaJeztah/distribution