Add test config to net_test_osi

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_osi

Change-Id: I5e26b7a9047e44aeeed12c4bcfce1f998183b597