brillo_update_payload: Pass postinstall config file to delta_generator.
If the target_files.zip contains META/postinstall_config.txt, then extract
it and pass the path to delta_generator.
BUG=b:24537566
TEST=Called brillo_update_payload with a target_files.zip that contains
postinstall_config.txt
Change-Id: I593c449e0194f3f72f4bcf712a03be472e12076d
Reviewed-on: https://chromium-review.googlesource.com/312550
Commit-Ready: Sen Jiang <senj@chromium.org>
Tested-by: Sen Jiang <senj@chromium.org>
Reviewed-by: Sen Jiang <senj@chromium.org>
1 file changed
