Add IPv4 counters. am: d561b7f67c am: d2956a1964 am: 17b18ca6c2

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1580287

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I56217d9b73e22372e8bdf61e96fa99593b324c24
tree: e208278fc3ffd5502c012982922855b637768128
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING