netinfo: report IPv6 information

Change-Id: Iaf195eeeb06ee385099e0d9f149d467e897717b8
Signed-off-by: huntxu <mhuntxu@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/9382
Reviewed-by: Adam Litke <agl@us.ibm.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>