Add test config to memory_replay_tests

This change allows TradeFederation to run the test directly.
Refer to b/35882476 for design and discussion of this change.

Bug: 35882476
Test: local test
tradefed.sh run template/local --template:map test=memory_replay_tests

Change-Id: Ibce3758f999e3f85624e5c6ca48f21f6e496b356