commit 7a5f968392f6a0139ee1c2dd589eb5c7821ddd90
author Alex Van Damme <atv@google.com> Wed Oct 31 16:46:54 2018 -0700
committer Alex Van Damme <atv@google.com> Wed Oct 31 16:54:54 2018 -0700
tree 86a42609855c402f484ebc90cccb9770b3a66276
parent 6424f71f63756a26d5770bfabed5637bcfda6757

Remove PACKAGES_FETCH_ROOT_DIRECTORY and friends

- Packages live in Apt now, so there's no reason to carry around this
legacy bit. It also is tough for external builds, as without a complete
packages.tgz to start with, you were unable to build.
- This changes the fallback logic for when a package is missing to
simply create the stamp file, and then the rootfs process will get the
package from apt. For this reason, there's no need to guard packages
with IS_EXTERNAL, either.

Change-Id: I490098f722cb5cf06b7373c8f26821b49e3b4de6