Enabling the --rate-limit-headers polutes the keyspace in Redis

[alexsnaps]

Since we mutate the Counters by setting the remaining & expires_in fields, and we are doing so prior invoking the SCRIPT_UPDATE_COUNTER, which also sadd the key to a set for that limit in redis, this creates dups for all these counters.
We probably need to refactor this so that we differentiate between CounterKey and Counter types properly