We should only try next address family if we meet ECONNREFUSED or
EHOSTUNREACH for v4 or ECONNREFUSED or EOPNOTSUPP or EHOSTUNREACH for v3v2.
Before, only a break in swich can not make the program out of for loop.
Signed-off-by: Yang Bai <hamo.by@gmail.com> Signed-off-by: Steve Dickson <steved@redhat.com>