IP connectivity metrics: NetworkEvents have transports

Also removes netId field from inside NetworkEvent and stop populating
the network_id field of the NetworkEvent field, deprecating it.

Bug: 34901696
Test: runtest frameworks-net,
      manually looking at $ adb shell dumpsys connmetrics

Change-Id: I2c36860f976898883714f72f4d18e06da250c6a6
1 file changed
tree: 417fb08b324318089c70cb22fe58ecfb0011cb74
  1. core/
  2. services/
  3. tests/