vhost-user-backend: Release new version (fix GET_VRING_BASE behavior)

[germag]

PR #161 doesn't reset the VQ after receiving a GET_VRING_BASE message.
(PR #154 it's also required, but it's already included in v0.9.0)

This fix is required to suspend/resume a VM with a vhot-user device, like virtiofsd:
https://gitlab.com/virtio-fs/virtiofsd/-/issues/110

[stefano-garzarella]

In #160 we are preparing a new release that will include also #161 ;-)

[stefano-garzarella]

vhost-user-backend v0.10.0 is just released with #161 included!