Ignore checking TRANSPORT_USB when Android version is older than S

There is a new transport type - TRANSPORT_USB(8) in Android S,
so when the test tries to add this new transport type in older
Android version, it cannot pass the transport type validation and
make test fail.

(clean cherry-pick of change in downstream branch history)
Original change ID before project move:
I38816173b04ea198d99f64f45e9271ac2641e4ac

Bug: 184158327
Test: run CtsNetTestCasesLatestSdk on Android R & Q
Merged-In: I3c2563d4ae4e3715d0c6270344ba8f7ef067872f
Change-Id: Ib0368241771d287c09c0e4463f91122533f85a27
1 file changed