The domblklist command is designed to show a brief information about the blocks
of a domain. One piece of information that is shows is "Target" and "Source".
Before the modification, the Vhost disk of SPDK is displayed as "-". After
the modification, the socket associated with it can be displayed.
Signed-off-by: dinglimin <dinglimin@cmss.chinamobile.com>
Signed-off-by: imxcc <xingchaochao@huawei.com>
(cherry picked from commit ba96974243af5faf2eb7d9ad88a0bfd35b5f7e15)
