Check if we can use certmod groups for sensible things

[rambo]

Like adding all RASENMAEHER users to group "rasenmaeher" by default, and when user is revoked move them to group "revoked" so even if OCSP only affects them on next reconnect we can do smart things based on the group

java -jar /opt/tak/utils/UserManager.jar certmod -g GroupA /opt/tak/certs/files/Denji.pem

See also https://mytecknet.com/managing-users-and-groups/

[karppo]

Default group "tak_default" added where all users will be added instead of ANON. pvarki/docker-atak-server@119f21c