The TetheringTests are green in postsubmit for a while.
Also add TetheringIntegrationTests to postsubmit.
Bug: 148998835
Test: atest --test-mapping frameworks/base/packages/Tethering:postsubmit
atest --test-mapping frameworks/base/packages/Tethering:presubmit
Change-Id: I80d29d06fde5a718c31a0a5ad2e2562be5bf419f
The tethering unit tests were in FrameworksNetTests, but were moved out
so were no longer run in presubmit. Now put them to postsubmit first.
Should be moved to presubmit after a while.
Bug: 148998835
Test: atest --test-mapping frameworks/base/packages/Tethering:postsubmit
Change-Id: I9ca36cba7bfde8409a06dbeb7166337c55b39691