devmode-test: make sure simple emerge works

We need emerge to work so we can install more binpkgs.

BUG=chromium:1197478
TEST=`./devinstall_test.py betty ../../../build/images/betty/latest/chromiumos_test_image.bin` works

Change-Id: Id0dc8c3f9dca10b7256cd43c59f4991d9314d7c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/2821653
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed