api/http_context: keep a const sharded<locator::token_metadata>&
api/http_context: keep a const sharded<locator::token_metadata>&

It has no need of changing token_metadata.

Signed-off-by: Benny Halevy <23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>

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