Split CLI.parseOpts into IO/non-IO parts
This will allow unittesting the CLI options much more easily. The patch also fixes an inconsistency: usage help was displayed with an extra new line in the error case (but not in --help). Signed-off-by:Iustin Pop <iustin@google.com> Reviewed-by:
René Nussbaumer <rn@google.com>
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