Test enable tethering permission and stopAllTethering

1. Test whether start tethering is gated by suitable permission.
2. Test stopAllTethering

Bug: 153613718
Test: atest CtsTetheringTest

Merged-In: I38702886ea355e1aec8eb8ac404fdd46a44582e3
Change-Id: I38702886ea355e1aec8eb8ac404fdd46a44582e3
2 files changed
tree: b14316620c12334536d16d0b5569d535b8dc43b2
  1. tests/