Handle utf-8 decoding error with backslashreplace option. am: e3f93faa90 am: 3737defe14 am: 0a1132147f am: fbf95e737a am: 9b4f51a7b4

Original change: https://android-review.googlesource.com/c/platform/tools/test/openhst/+/1427008

Change-Id: If177ed9821295427937ba2e0d2f4cb6516af715b