The test checks if (IPv4, IPv6) address pair properly conflict or not.
* IPv4
* 0.0.0.0
* 127.0.0.1
* IPv6
* ::
* ::1
If the IPv6 address is [::], the second bind() always fails.
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>