Address API review feedback

Address API review feedback to:
 - Rename NetworkAgent#setTeardownDelayMs to
   NetworkAgent#setTeardownDelayMillis
 - Use getters instead of fields in VpnTransportInfo
 - Rename registerDefaultNetworkCallbackAsUid to
   registerDefaultNetworkCallbackForUid in ConnectiivityManager

Bug: 183972850
Bug: 185246410
Fix: 184735863
Test: make update-api
Test: atest FrameworksNetTests
Test: atest CtsNetTestCasesLatestSdk
Change-Id: I5e8c4bed8bda40d507afa894c359b5e24ee5d868
Merged-In: I5e8c4bed8bda40d507afa894c359b5e24ee5d868
5 files changed
tree: b069281cd9187ddb7c453698474339e500f4f705
  1. framework/
  2. service/
  3. OWNERS
  4. TEST_MAPPING