Change tethering file structure to respect its package name

Bug: 145099347
Test: atest TetheringTests
      atest CtsTetheringTest
Change-Id: I7401c550fbafd17a5ed2d925b5d0e17e358af467
Merged-In: I7401c550fbafd17a5ed2d925b5d0e17e358af467
28 files changed
tree: 08fbf12a0274f66540ba61a967b796b4a88ecc37
  1. Tethering/