1. Add datamodel api and policy_enfoce file. 2. Add related unittest for data_model api and policy. Partially Implements:blueprint show-datamodel-api Change-Id: I1654685d8cf04db5dd132d43a8640ddf91893cad
1. Add datamodel api and policy_enfoce file. 2. Add related unittest for data_model api and policy. Partially Implements:blueprint show-datamodel-api Change-Id: I1654685d8cf04db5dd132d43a8640ddf91893cad