Merge "Merge "Atest: add delimiter() for easy printing." am: 601d7e5bd7 am: fddef03d70" into rvc-dev-plus-aosp am: c5c0625367 am: f849997a6a am: 4385163941

Change-Id: Iae4c66f0f0b320b4eb05d187cc4f225b569c7f2c