Make sure getActiveNetwork is consistent with default callbacks

Almost clean cherry-pick of ag/3889538.

Bug: 77737389
Test: runtest framework-net
      new test don't pass without the main code change, but they
      do with it
Change-Id: I0cd83a935ab0b349aa47e065b830e5a43ab9a091
Merged-In: Iaa0285825735d3f16bba6e4946723a437fd9b0b9
Merged-In: Ia8f985b448251f911484e6bd63fa562bffc1b0e4