Add tests for new Sdump function.
Add tests for new Sdump function.

This commit adds tests for the new Sdump function both at the package
level and as a part of a ConfigState.

dvln/go-spew,dvln/go-spew,bparees/go-spew,davecgh/go-spew,FactomProject/go-spew,bparees/go-spew,kortschak/utter,davecgh/go-spew,FactomProject/go-spew