[dts] [PATCH V1] tests/vhost_user_interrupt:modify execute virtio-user server side testpmd command after client side started

[Tu, Lijuan]

> In DPDK 9af79db20f4cf, when launch virtio-user testpmd as server mode, virtio-
> user server side testpmd expected character will be 'wait for client side
> started...', after client side started, it change to 'testpmd>', so dts need modify
> execute virtio-user server side testpmd command after client side started.
> 
> Signed-off-by: Ling Wei <weix.ling at intel.com>

Applied, thanks