Merge "[NFCT.NS.12] Override toString methods in conntrack related classes" am: 2676dea8c8 am: ae044dbf8b

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I791d3cf4820d175d17a46e556607f7e1f9d56e30