On boot system keyspace is kicked to insert local info into system.local
table. Among other things there's dc:rack pair which sys.ks. gets from
its cache which, in turn, should have been previously initialized from
snitch on sys.ks. start. This patch makes the local info updating method
get the dc:rack from caller via argument. Callers, in turn, call snitch
directly, because these are main and cql_test_env startup routines.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
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