lib: domain: Emphasise that users should wait for block job READY state via events
The transition to the ready state is best observed by events as it's ansynchronous and does not hint users to do polling. As currently only the qemu driver supports block copy and block commit and the ready state event was introduced by qemu 1.3 we can fully switch to the new approach. Signed-off-by: NPeter Krempa <pkrempa@redhat.com> Reviewed-by: NJán Tomko <jtomko@redhat.com>
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