tryCell configuration would not be force disabled UpstreamMonitor stop.
If tethering stop with using mobile upstream and swap with SIM fron no
dun to dun supported, dun request would be filed even tethering is not
active.
Bug: 173068192
Test: atest TetheringTests
Original-Change: https://android-review.googlesource.com/1715791
Merged-In: I5505655f52da9fdca2fd43a58e043a9ab727741d
Change-Id: I5505655f52da9fdca2fd43a58e043a9ab727741d
2d36831a38