vhost-user-backend: prepare v0.16.1 release

Remove the gpu-socket feature just introduced, since it doesn't work
well with cargo feature unification.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>

vhost-user-backend/CHANGELOG.md

@@ -7,6 +7,10 @@
 
 ### Deprecated
 
+### Fixed
+
+## v0.16.1
+
 ### Fixed
 - [[#267](https://github.com/rust-vmm/vhost/pull/267)] Fix feature unification issues with gpu-socket feature.
 

vhost-user-backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "vhost-user-backend"
-version = "0.16.0"
+version = "0.16.1"
 authors = ["The Cloud Hypervisor Authors"]
 keywords = ["vhost-user", "virtio"]
 description = "A framework to build vhost-user backend service daemon"