Merge changes I3fcd7eb8,I4bf2c762

* changes:
  Add error counters for various failures.
  Add a bpf_tethering_headers lib used by the programs and JNI.
tree: 6fe73621380e7f0a34955ad30d49d26c117d93fb
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING