make UpsreamNetworkMonitor the sole source of upstream network information

Test: as follows
    - built
    - flashed
    - booted
    - runtest frameworks-net passes
Bug: 29337859
Bug: 32163131

Merged-In: If45443143777e1446c812563742ae8af68d8f73e
Merged-In: Ifeb49f1b19ab36e438763b569c78a335b094f7d0
Merged-In: Idfebb9b79074f21aeccf773cac98aa7839bda9da
Change-Id: I66ce682cf9c31887264a095a4e4638d281d8ed39
(cherry picked from commit 5bbece74)