generate_au_zip.py: Place ELF files in .elf/ sub-directory.

This patch prevents e2cp from being renamed to e2cp.elf by placing it
inside the directory .elf in the au-generator.zip file.

CQ-DEPEND=CL:296424
BUG=chromium:526753
TEST=Ran cros_generate_update_payload from an old image in the generated zip file environment.

Change-Id: Icf043a4ca6d8bcc19058be3cf49678fb163c684f
Reviewed-on: https://chromium-review.googlesource.com/296426
Commit-Ready: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed