net/virtio-user: fix start with kernel vhost

net/virtio-user: fix start with kernel vhost

After reset owner in below patch, we failed to set owner before
sending further vhost messages. It is OK with vhost user implemented
DPDK/VPP/Contrail, but it sees "Operation not permitted" error when
used with vhost kernel.

We fix this by setting owner every time the device is started.

Fixes: 0d6a8752ac9d ("net/virtio-user: fix crash as features change")
Cc: stable@dpdk.org
Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>