Update the QUIC packet format.

The QUIC packet format has changed again. Update the test to
ensure that the GFE can drop support for the old packet format
without causing all devices to fail CTS.

Packet format changes suggested by dschinazi@.

Bug: 170724836
Test: atest --rerun-until-failure 100 CtsNetTestCasesLatestSdk:MultinetworkApiTest#testNativeDatagramTransmission
Change-Id: I8625ac9a58c55fc19dfb9fdb5f34a89cee40caaf
Merged-In: I8625ac9a58c55fc19dfb9fdb5f34a89cee40caaf
1 file changed