Include interface statuses in the status-get response

I have a slight problem with Kea DHCP daemons during writing system tests for Stork. I run the Kea in the Docker container, and next, I use the perfdhcp to generate traffic. The Kea daemon starts very quickly after the container runs, and not all interfaces are available yet. I used the retry socket binding solution developed in #1716 (closed), which works as expected. But there is no possibility of checking if the binding passed successfully. It means I don't know when I can safely call the perfdhcp.

It will be convenient to include the interface listening statuses in the status-get command response.

It isn't is a blocker for me. I'm writing the shell script that checks the interface status using Linux net-tools. I tried to write the shell script that checks if the binding is available, but I failed,