Add CTS test for APFv6 ICMPv6 ping reply filtering

Added a CTS test case to verify APFv6 implementation by sending an
ICMPv6 ping request with a 56-byte payload. The reply was expected to be
dropped by the APF program. The APF program was expected to sent another
ICMPv6 ping request with a 1-byte payload. The reply was expected to be
accepted by the APF program. Finally, The test confirms if the second
ping reply is received.

Test: TH
Change-Id: I322e7c0674ac9df60579d9e6d44690e383004d36
1 file changed