storage_service: do_replicate_to_all_cores in do_update_pending_ranges
storage_service: do_replicate_to_all_cores in do_update_pending_ranges

Currently update_pending_ranges involves 2 serialized actions:
do_update_pending_ranges, and then replicate_to_all_cores.

These can be combind by calling do_replicate_to_all_cores
directly from do_update_pending_ranges.

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

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