run-test-jar: Reduce environment passed to tests. am: d7674c2621 am: 4661bcb7bf am: 42b29b7c3b am: f2f9e78189 am: deb814bb87

Original change: https://android-review.googlesource.com/c/platform/art/+/2240694

Change-Id: I744e6ecdee5eccebe3c77f761089529a9c51069a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>