Fix isns to handle multiple portals

See https://bugzilla.redhat.com/show_bug.cgi?id=865739

Report all portals to iSNS. If listening on an INADDR_ANY (0.0.0.0) or
INADDR6_ANY (::) then report the IP that we're using to connect to the
iSNS server as the one to use. If listening on both v4 and v6 ANY
addresses, only report one.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>