I'm not really sure what it is doing, but it seems to mess up all the
files. I think we are better copying and modifying existing fixutres.
Change-Id: Idf58e18976b023366c787796e50b0221c6f01d14
We were overwriting the loopback interface definition, which makes Clint
unhappy.
Also - in doing this, noticed that the test regeneration was off. Fixed
it.