Move EXITCODES from common-config to judgehost-static.

It's only used outside the judgedaemon for a configcheck, which is
of rather limited value. Moving this removes a needless interdependency
between domserver and judgehost configs. Moving it to -static since
it's not normally something anyone should change.
Remove unused domserver-static.h.in

Also clarify that sudoers is only for judgehost.
transfig no longer needed