[autotest] remove unnecessary md5 calculation

As part of effort to make build_package run faster, unnecessary md5sum is
removed in process_all_packages call.

Change in CL 65911 changed the way packages.checksum is updated for each
package. Each package's md5 will be calculated in pkgmgr.upload_pkg call as
update_checksum is set to True. In call BasePackageManager.update_checksum,
each package's md5 is calculated and updated in checksum dictionary, which
then is saved to packages.checksum file.

BUG=chromium:282663
TEST=run build_package successfully.

Change-Id: Ib3822a27c9fce8d3b99f7bb40888a6ad9c60c623
Reviewed-on: https://chromium-review.googlesource.com/167926
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Alex Miller <milleral@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
1 file changed