This is problematic because it can stomp over pre-existing host-specific
local files, which we'd end up removing. It also requires to run ngcpcfg
before being able to execute the tests.
We wwitch to use golang's text/template support for environment variables
so that we can stop using this hack.
Change-Id: I6c4d5b2efde2704d68a327d4df9af51bcb8fd964