Wait for SSH's stdin and stderr to be drained. - #5052
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So far, fast commands would finish before we're done draining their `stdin` and/or `stdout`, which would result in lost output. This PR adds a wait group to make sure that we're done draining before returning.
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So far, fast commands would finish before we're done draining their
stdinand/orstdout, which would result in lost output. This PR adds a wait group to make sure that we're done draining before returning.