virsh: Convert '<cmd> --help' to 'help <cmd>'
Often times I find myself halfway through typing a long command when I want to see 'help' output. I instinctively append '--help' to the command I'm typing, only to get an error: $ virsh vol-create-as foo --help error: command 'vol-create-as' doesn't support option --help This patch makes --help work in a pretty hacky way. One missing piece here is that --help isn't listed as an option in the actual 'help <cmd>' output, but maybe this can be a starting point for someone.
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