Add IPv4 counters. am: d561b7f67c am: d2956a1964

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic66884108ae7fde4c1688847f7b2092c8d6e941d
tree: 5ccdde34777c631af718e8213afc23cc085d0b1d
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg
  6. TEST_MAPPING