Merge "[NFCT.NS.12] Override toString methods in conntrack related classes" am: 2676dea8c8

Original change: https://android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/1495896

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I38f4e60b757f30e5d9768a1cb8eee58cb30595d0