scheduler: Retry SyncJobs with a small delay if it fails
scheduler: Retry SyncJobs with a small delay if it fails

Signed-off-by: Lewis Marshall <748e1641a368164906d4a0c0e3965345453dcc93@lmars.net>

philiplb/flynn,flynn/flynn,benbjohnson/flynn,lmars/flynn,benbjohnson/flynn,flynn/flynn,benbjohnson/flynn,rikur/flynn,philiplb/flynn,lmars/flynn,rikur/flynn,rikur/flynn,rikur/flynn,flynn/flynn,rikur/flynn,lmars/flynn,benbjohnson/flynn,philiplb/flynn,flynn/flynn,benbjohnson/flynn,lmars/flynn,flynn/flynn,philiplb/flynn,benbjohnson/flynn,lmars/flynn,rikur/flynn,philiplb/flynn