Unit test automation for Multilayer Evaluation

Unit test automation for multilayer network hierarchy evaluation
when using the setOemNetworkPreference() API ConnectivityService.

Bug: 178632672
Bug: 176494815
Bug: 170068946
Test: atest FrameworksNetTests
Change-Id: Ia9b76f49a07eff6a3977faaa41fc67a10f307841
1 file changed