extract_files: Adjust deodex path and tmpdir

* Make a tempdir using the mktemp command rather than just making a
  dir in /tmp to accomodate for systems that don't set proper perms
  or dont have /tmp
* Fix the deodex procedure to pull files from the right path

Change-Id: I181863599b6670e3a149069dbb7b13ebf73bae8e