Add write_rrd_multi, create_rrd_multi and update_rrd_multi
Add write_rrd_multi, create_rrd_multi and update_rrd_multi

holzman/glideinwms-old,bbockelm/glideinWMS,holzman/glideinwms-old,bbockelm/glideinWMS,bbockelm/glideinWMS,holzman/glideinwms-old,bbockelm/glideinWMS