system-keyspace: Use db::config in setup_version
system-keyspace: Use db::config in setup_version

This is the beginning of de-globalizing global qctx thing.

The setup_version() needs global qctx to get config from.
It's possible to get the config from the caller instead.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

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