ClatUtils: add test GenerateIpv6AddressFailWithUlaSocketAddress

Used for increasing the test coverage of generateIpv6Address.

For now, generateIpv6Address test coverage: 0% (0/27 lines)
https://blackbox.googleplex.com/testsuite?branch=git_tm-mainline-prod-daily-release&target=mainline_modules_x86_coverage_r_released&testsuite=coverage%2Fmts_tethering_native_t_on_t&type=coverage

This is not a realistic test. The generateIpv6Address functionality is
not real verified. See also test MakeChecksumNeutral.

TODO: remove this test once EthernetTetheringTest can
test on mainline test coverage branch.

Test: atest ClatUtils

Change-Id: I8e4fbc5af2cd0dd0a1bb181388ea0d4b200baed3
1 file changed