netinfo: pass _netinfo to addNetwork

Bug-Url: https://bugzilla.redhat.com/1053114
Change-Id: I67e539bd51f89f645223ec7f80f42f0a7bab0cdd
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/23578
Reviewed-by: Dan Kenigsberg <danken@redhat.com>