tests: Temporarily disable socket test due to a kernel bug

There’s a kernel bug on the CI machines which is causing this test to
fail all the time and it’s getting my goat.

The test can be re-enabled later (by reverting this commit) when the
kernel on the CI VM host is fixed. I don’t know when that’s going to
happen.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Helps: #2879
12 jobs for socket-reuse-tests in 21 minutes and 41 seconds (queued for 1 second)