distributed_loader: pass column_family to load_sstables_with_open_info
distributed_loader: pass column_family to load_sstables_with_open_info

Rather than just its schema.

In preparation for adding table::make_sstable

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

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