Pipe input to integration test subprocess am: 586b031bd6

Original change: https://android-review.googlesource.com/c/platform/tools/asuite/+/3310176

Change-Id: I9722e3b29c69867dfbf789cdcd86d5676a0057d5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>