Add test config to net_test_hci

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=net_test_hci

Change-Id: Ifbac48ad8b425f43e6c919696cc72d5997e614db