Kristin Laemmert c9d62bb2f6 command: discard output from flags package and return errs directly (#22373) ...

Any command using meta.defaultFlagSet *might* occasionally exit before
the flag package's output got written. This caused flag error messages
to get lost. This PR discards the flag package output in favor of
directly returning the error to the end user.

2019-08-16 08:31:21 -04:00

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