Comment 0 for bug 1934293

[Impact]
We have this test disabled intentionally in the past because of the lack of commit 27d53323664c54 "l2tp: remove skb_dst_set() from l2tp_xmit_skb()" in our kernels.

The way we disable it is to override the executable state with our autotest-client-test suite [1], but this makes the test suite complain about script is not executable. Henceforth we further disable it by removing it from the Makefile in "UBUNTU: SAUCE: selftests/net -- disable timeout"

Now with commit 27d53323664c54 landed and l2tp.sh test re-enable in out test suite [2], we still need to revert that SAUCE patch to get it tested.

[1] https://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=05d7eebf32c6872ebce6c9e5275b1ff9d91ecd16
[2] https://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=7dea7776ce431e5a1c550dc73b1d9ac0ba49698d

[Fix]
Revert "UBUNTU: SAUCE: selftests/net -- disable timeout"

[Test]
Run the net test suite in kselftest with patched source tree:
  sudo make -C linux/tools/testing/selftests TARGETS=net run_tests

The l2tp.sh test will be executed.

[Where problems could occur]
This is only for testing tools, however if commit 27d53323664c54 "l2tp: remove skb_dst_set() from l2tp_xmit_skb()" didn't land properly we might crash our testing node like in bug 1854968. Also, we might see new failures for this test in the test report.