pull: relay along errors encountered #737
Merged
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Fixes #734.
Capture errors after parallelized pulls.
Also avoid shadowing errors on result waiting.
The changed code was legacy of an oversight after the old days
in which we didn't send back exit codes to the outside world.
After exit codes were added to drive, the pull code was never touched.
Even still though, we had logging for errors and users could see their
errors.
Exhibits: