qemu-img: Allow -o help with incomplete argument list
This patch allows using 'qemu-img $subcmd -o help' for the create, convert and amend subcommands, without specifying the previously required filename arguments. Note that it's still allowed and meaningful to specify a filename: An invocation like 'qemu-img create -o help sheepdog:foo' will also display options that are provided by the Sheepdog driver. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NJeff Cody <jcody@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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