Add test config to libappfuse_test

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=libappfuse_test

Change-Id: Ic3a23d9d609036658fd37fc72571e2fc7db0e88d