androidbuild: Search homedir of $PORTAGE_USERNAME for credentials.
This makes it possible to use `abutil` from within an ebuild file and
still find .ab_creds.json in the user's home directory.
BUG=b:24972874
TEST=Unittests pass.
TEST=Used abutil to successfully fetch an image.
TEST=Used an ab:// URL in an ebuild and confirmed emerge-$BOARD works.
Change-Id: Iaa9310de2eb44328d16bfe60e36d26017ea8575e
Signed-off-by: Filipe Brandenburger <filbranden@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/315942
Reviewed-by: Don Garrett <dgarrett@chromium.org>
2 files changed
