x/net/ipv4: test fails on IPv6-only kernels

[mikioh]

http://www.freebsd.org/ipv6/ipv6only.html

Sure, it fails.

[mikioh]

Comment 2:

Labels changed: added priority-soon, removed priority-triage.

Owner changed to @mikioh.

[rsc]

Comment 3:

Labels changed: added go1.3maybe.

[rsc]

Comment 4:

Labels changed: added release-none, removed go1.3maybe.

[rsc]

Comment 5:

Labels changed: added repo-net.

[mikioh]

Comment 6:

https://golang.org/cl/27460043/