Handle the "Reason" tag in ResultHandler am: f3a49755b2 am: d793e6c6e0

Original change: https://googleplex-android-review.googlesource.com/c/platform/test/suite_harness/+/12798063

Change-Id: I9958692a363499d9b9785eb17fc0ceccfacc55d1
tree: 46b8b485fde568432a2201ac874d20d3110f3f8c
  1. build/
  2. common/
  3. tools/
  4. OWNERS
  5. PREUPLOAD.cfg
  6. test_defs.sh