vhost-user-blk: set config ops before vhost-user init
As soon as vhost-user init is done, the backend may send VHOST_USER_SLAVE_CONFIG_CHANGE_MSG, so let's set the notification callback before it. Also, it will be used to know whether the device supports the config feature to advertize it or not. Signed-off-by: NMaxime Coquelin <maxime.coquelin@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Acked-by: NChangpeng Liu <changpeng.liu@intel.com>
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