The test tries to connect a socket to a closed port at 127.0.0.1.  It
sets O_NONBLOCK on the socket first and expects to get EINPROGRESS from
connect(2), but this is not guaranteed, ECONNREFUSED is possible.
Handle both cases, and re-enable the test.

PR:		240621
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation