Merge changes from topic "cs-generalize-underlying-networks"

* changes:
  Update NetworkAgentTest to support generalized underlying networks.
  Minor fixes to NetworkAgentTest.
tree: 38e42130d647ae63c403b170473d96e9a863e070
  1. tests/
  2. Tethering/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg