locator: token_metadata: reuse utils::stall_free clear_gently helpers
locator: token_metadata: reuse utils::stall_free clear_gently helpers

Use the generic clear_gently functions that were added
in eca9f45c59f178130215010c9905ab7b8450b771.

Test: unit(dev)

Signed-off-by: Benny Halevy <23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>
Message-Id: <20210706090243.1776466-1-23c997c90eb8537635e9392d48e7af1bf1b2ca22@scylladb.com>

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