netlink: Do not truncate InfiniBand HW addresses anymore

Change-Id: Ib53e6518d0f2f8ea573451d04ae8cb0464142a17
Signed-off-by: Ondřej Svoboda <osvoboda@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/28554
Reviewed-by: Dan Kenigsberg <danken@redhat.com>