net/virtio-user: fix crash as features change

net/virtio-user: fix crash as features change

Since commit 59fe5e17d930 ("vhost: propagate set features handling error"),
vhost does not allow to set different features without reset.

The virtio-user driver fails to reset the device in below commit.

To fix, we send the reset message as stopping the device.

Fixes: c12a26ee209e ("net/virtio-user: fix not properly reset device")
Cc: stable@dpdk.org
Reported-by: Lei Yao <lei.a.yao@intel.com>
Reported-by: Tiwei Bie <tiwei.bie@intel.com>
Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
Acked-by: Yuanhan Liu <yliu@fridaylinux.org>