Stop giving out version 2-style routerstatuses to controllers
From #8913 (moved):
atagar points out that the control protocol still lets you ask for stuff in v2-formatted ways, and I believe that is still working. So maybe not all of v2 is in the attic yet.
Is this still the case? If so, we should probably remove the code that gives out version 2 descriptors to controllers. And the code that lets controllers ask for version 2 descriptors. And the respective parts in control-spec. Version 2 is dead.