Use Kerberos for Agent Registration
Registering an agent (TLS and Updater) currently needs a username and password or secret to be able to login to the checkmk site.
The process of doing so runs as a certain user account on the machine that gets registered.
It would be good to be able to use an existing Kerberos ticket that this account holds. This would make it not necessary to have cleartext credentials when deploying the agent.