Refactor VTI tests to support null encryption
am: 91b562615b

Change-Id: Ibd1f11362637c884a6b3ba7188362252d5d30d05
tree: 3c76fc5f6f5f467017fdc0e1ade67cc6b7f9010e
  1. devicetree/
  2. net/
  3. Android.bp