configNetwork Missing space in error string

Change-Id: I347a789b1e332bcf3a278f9428aa2702d9cd6fe6
Signed-off-by: Antoni S. Puimedon <asegurap@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/20010
Reviewed-by: Dan Kenigsberg <danken@redhat.com>