Bug 1505 - Added test model and instance identifier test for augmentations

Added binding-test-model, which contains models for unit testing
and integration testing of binding runtime components such as binding-data-codec.

Change-Id: Ib8219252eec5c2e1b4ddda806bea7367b7c41f9b
Signed-off-by: Tony Tkacik <ttkacik@cisco.com>
Merge "Bug 1505 - Added test model and instance identifier test for augmentations"