brillo_update_payload: Parse minor version from the metadata.

META/update_engine_config.txt contains KEY=value config options with
the supported version. This patch uses the supported minor version from
the source image to generate the right delta payload.

BUG=b:24406755
TEST=brillo_update_payload with old/new taget_files including and not including the update_engine_config.txt file.

Change-Id: I3dacaeeeda9bbde3991a95fbf7834542af0b5780
Reviewed-on: https://chromium-review.googlesource.com/302624
Commit-Ready: Alex Deymo <[email protected]>
Tested-by: Alex Deymo <[email protected]>
Reviewed-by: Jason Kusuma <[email protected]>
Reviewed-by: Mike Frysinger <[email protected]>
1 file changed
tree: 8007c8c03d278d5afe7c7ce24e6a83bbf6ba7a03
  1. scripts/