Updating tests to honor per-app TRACK_DEFAULT

Per-app APIs in ConnectivityService will now have their fallback
request which tracks the system default be of type TRACK_DEFAULT
as opposed to REQUEST. Existing tests which expect this fallback request
to be sent to network factories need to be updated to validate this
change.

Bug: 180452284
Bug: 176494815
Test: atest FrameworksNetTests
Change-Id: I5125755b3ed1ec535494e2d7a48c0860710ed056