Fix stdout and stderr handling in sub commands #53
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Currently the shell executor and gitCmd helper writes exessive newlines during
execution after the upgrade of go-cmd/cmd where handling of the Stderr and
Stdout channels was changed.
The update was introduced in dd2f8b3 to fix
missing output of git-plan commands but was mistakenly not ported to the other
uses of the cmd package.
This change set updates usage of package cmd when configured with streaming
output.