Seems that OpenBSD behaves like darwin and requires to unlink all
socket, after it was used.
Tested on OpenBSD 7.4
Signed-off-by: Kirill A. Korinsky <kirill@korins.ky>
(cherry picked from commit 2c214241fa)
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>