F auths spi

I added a 'configure' method that passes in the params when the auth provider is loaded, based on your other comment. Does that cover it?
I'm not sure how it would work when you say 'In the Spring context, the getAuth method can pull the principal from the Map' - wouldn't that mean that the AccumuloDataStore would have to populate the map with the spring-specific principal? The map is just what gets passed to DataStoreFinder.getDataStore(conf), right?