OVN-Kubernetes 1.3 release

[Surya Seetharaman]

Hello all!

The OVN-Kubernetes 1.3 release cut has happened! We have also created a new release-1.3 branch.

Please find release notes here: https://github.com/ovn-kubernetes/ovn-kubernetes/releases/tag/v1.3.0

Since 1.3 release is cut, this means we officially stop supporting and backporting things into 1.1 release unless anyone has objections. This is based off of previous conversations we've had where the community supports only 2 releases at a time (https://ovn-kubernetes.io/developer-guide/release/#information-on-past-releases).

Cheers,

Surya