qemu-img: Add "Quiet mode" option
There can be a need to turn output to stdout off. This patch adds a -q option that enable "Quiet mode". In Quiet mode, only errors are printed out. Signed-off-by:Miroslav Rezanina <mrezanin@redhat.com> Reviewed-by:
Kevin Wolf <kwolf@redhat.com> Signed-off-by:
Stefan Hajnoczi <stefanha@redhat.com>
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