Solr 4 testing configs

Some changes are needed in the test configs to properly run the solr tests for solr 4+.  I have chosen 4.2.1, since it is the latest release, there are trivial changes to make this work on 4.0 and 4.1, but that can be left as an exercise to the developer.  Since a number of our users still use 3.X (author included) I felt that for the time being we should be prepared to support both, until Apache stops offering the 3.X download on the main page or we upgrade to 4 at my current position :).

I did this in the hopes of making testing the slew of solr 4 changes easier, but it may mean some trivial changes become less trivial if they break our interactions with solr 3.  Also, any thoughts on handling changes that are specific to 3 or 4 are greatly appreciated.

I *could* have just committed this, but I would just like to get someone else to give this a try and/or feedback, suggestions, etc.