[Zun][Kata] Devstack plugin for installing Kata container

Hi all, I have a patch [1] that adds support for installing kata Container in devstack. Right now, it configures kata container to run with Docker. In the future, I plan to add support for containerd's cri plugin, which basically allows running pods with kata container. Initially, OpenStack Zun will use this plugin to install Kata container, but I believe it would be beneficial for other projects. Appreciate if anyone interest to cast your feedback on the patch. [1] https://review.opendev.org/#/c/668490/ Best regards, Hongbin