v1.0.21
This release contains:
1. Division of HnsNetwork by subnet.
2. Added support for running CNI on ubuntu 17 or greater. Added code to configure dns server IP on azure bridge. systemd-resolved changed the way of configuring dns server on ubuntu VMs. Added code in CNI to adapt this change.
3. Moved HNS related APIs from platform package to cns/hnsclient package.