dht/token: shard_of: reuse shard_of_minimum_token
dht/token: shard_of: reuse shard_of_minimum_token

Returning shard 0 for the minimum token better
be hardcoded in one place.

Signed-off-by: Benny Halevy <23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>
Message-Id: <20210428113339.1092555-1-23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla