Packaging convert_recovery_to_ssd script for use during the delta generation. BUG=15031 TEST=Ran generate-au-zip.py to generate a zip file. Change-Id: I4b202959d25405f172b95c813f061c6f9b210d1c Reviewed-on: http://gerrit.chromium.org/gerrit/466 Reviewed-by: David McMahon <djmm@google.com> Tested-by: Raja Aluri <aluri@chromium.org> Reviewed-by: Raja Aluri <aluri@chromium.org> (cherry picked from commit 7145352a0b96b0bb0dbaed922bfda950290ecfc9)