Add Tests for EthernetNetworkFactory am: 4a60d53369

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1486182

Change-Id: If2049d3b4484d68232a9ce1b405aa438c9c673fa
tree: 40c7edada5840dc4d035cba8124282da17001ffd
  1. service-t/
  2. tests/