netinfo: drop unused graph() function

Change-Id: I245e5f83f56ef3aba7b3095724ec3fb54854ab4a
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34065
Reviewed-by: Ido Barkan <ibarkan@redhat.com>
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>