Suggestion of change to certauth plugin interface

[Ken Hornstein]

I just now realized that there's not a wonderful way of getting the
list of realms the KDC is configured to use AND it would be incredibly
useful if the certauth plugin knew the list of configured KDC realms.
Is it possible that the realmlist could be passed to the certauth plugin
initialzer function?  I realize that would probably require a major bump
to the certauth plugin API.

--Ken