selftests/net: Test tcp port reuse after unbinding a socket

Exercise the scenario described in detail in the cover letter:

  1) socket A: connect() from ephemeral port X
  2) socket B: explicitly bind() to port X
  3) check that port X is now excluded from ephemeral ports
  4) close socket B to release the port bind
  5) socket C: connect() from ephemeral port X

As well as a corner case to test that the connect-bind flag is cleared:

  1) connect() from ephemeral port X
  2) disconnect the socket with connect(AF_UNSPEC)
  3) bind() it explicitly to port X
  4) check that port X is now excluded from ephemeral ports

Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://patch.msgid.link/20250917-update-bind-bucket-state-on-unhash-v5-2-57168b661b47@cloudflare.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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