vhost-user-backend: Prepare v0.16.0 release

This release has the following changes:
  1. Move the set of event_idx property from set_vring_base callback to set_features one
  2. Add shared objects support
  3. Add support for `VHOST_USER_GPU_SET_SOCKET`
  4. Update virtio-queue version from 0.12.0 to 0.13.0 and vm-memory from 0.14.0 to 0.15.0.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

vhost-user-backend/CHANGELOG.md

@@ -1,17 +1,24 @@
 # Changelog
 ## [Unreleased]
 
+### Added
+
+### Changed
+
+### Deprecated
+
+### Fixed
+
+## v0.16.0
+
 ### Added
 - [[#241]](https://github.com/rust-vmm/vhost/pull/241) Add shared objects support
 - [[#239]](https://github.com/rust-vmm/vhost/pull/239) Add support for `VHOST_USER_GPU_SET_SOCKET`
 
 ### Changed
+- [[#257]](https://github.com/rust-vmm/vhost/pull/257) Update virtio-queue version from 0.12.0 to 0.13.0 and vm-memory from 0.14.0 to 0.15.0.
 - [[#240]](https://github.com/rust-vmm/vhost/pull/240) Move the set of event_idx property from set_vring_base callback to set_features one
 
-### Fixed
-
-### Deprecated
-
 ## v0.15.0
 
 ### Changed

vhost-user-backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "vhost-user-backend"
-version = "0.15.0"
+version = "0.16.0"
 authors = ["The Cloud Hypervisor Authors"]
 keywords = ["vhost-user", "virtio"]
 description = "A framework to build vhost-user backend service daemon"