qemu: capabilities: Add QEMU_CAPS_BLOCKDEV_REOPEN
This capability will be asserted once qemu stabilizes 'blockdev-reopen'. For now we just add the capability so that we can introduce some code that will use the reopening call. This will show our willingness to adopt use of reopen and help qemu developers stabilize it. Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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