host/cli: Only start one scheduler instance when restoring from backup
host/cli: Only start one scheduler instance when restoring from backup

Subsequent job requests can race with the first scheduler and cause a
ratelimit error during bootstrap. We only need one, as the rest will be
started by the scheduler.

Closes #2540


Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>
philiplb/flynn,lmars/flynn,philiplb/flynn,lmars/flynn,philiplb/flynn,philiplb/flynn,lmars/flynn,flynn/flynn,flynn/flynn,lmars/flynn,flynn/flynn,philiplb/flynn,flynn/flynn,lmars/flynn,flynn/flynn