dfutil: Move fiels out of scripting directory

The "scripting" directory was only there for historical reasons. In
older versions of the code, the first part of a .test file (up until the
first item) was interpreted as JavaScript code, using Apple's
JavascriptCore API. This was removed when porting to Linux, and now the
tests are identified by action name only. There's no longer any
scripting actually involved within individual .test files. so the
directory no longer makes sense.