client: fix overly aggressive project-wide file transfer backoff policy. #4575
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Old: if we get more than 3 upload or download failures for a project,
do a backoff for each failure.
Problem: if we start a bunch of transfers (say the N output files of a job)
and they all fail, we back off for too long, e.g.:
try N uploads
back off 2^N minutes
try N uploads
back off 4^N minutes
...
New: on a failure, ignore it if we're already backed off.
So the behavior should be something like:
try N uploads
back off 1 minute
try N uploads
back off 2 minutes
...
Should fix #4572