More swh-scheduler fixes
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Fix get_scheduler's cls value when using 'swh-scheduler --url' cli option
also ensure args dict does not have default db settings (unsupported by the RemoteScheduler class).
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Fix 'swh-scheduler runner' command: rollback() has beed removed from the SchedulerBackend
and is not needed any more there.
Migrated from D1043 (view on Phabricator)