Update gRPC Java Testing Lib to build Host and Android clients. am: a97c369d0c am: 400d5deff6 am: 416e81f33e

Original change: https://android-review.googlesource.com/c/platform/external/grpc-grpc-java/+/1531218

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I3d01a9660e7feb55a8faf576cc320c6f138fc356