Qemu: Set more default env variables in testrunner am: 6a181d347d am: 80a9e72914

Original change: https://android-review.googlesource.com/c/platform/art/+/2977715

Change-Id: I7cad25a5df60935dc8b08734065c03b3bf1d2bfe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>