Merge history of opt/net/ethernet

Renamed files/directories:
java/ --> service-t/src/
tests/ --> tests/ethernet/
Android.bp --> (removed)
OWNERS --> (removed)
.gitignore --> (removed)

BUG: 222234190
TEST: TH
Merged-In: I770bf8db3f4c18467934eb2184f5dc2408fc28ec
Merged-In: I3e5df1bd44defbb9dd0c382c625a21e176368f2a
Change-Id: Ifc02784499d114e12d8ad64ba011dd23b97fb78b