storage_service: Relax repeating set_mode-s
storage_service: Relax repeating set_mode-s

In several places the call to set_mode(...) is used as a (format-less)
replecement for regular logging. Mode doesn't really change there, because
it had been changed before. Patch all those places to use regular logging,
next patches will make full use of it.

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

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