added back wms212

wms212.cern.ch was removed ( by me) from /afs/cern.ch/cms/LCG/crab/config/glite_wms_CERN.conf on Apr7 because Filippo Spiga reported it was hanging output, enough time has passed that should be drained. Status from CERN monitoring page looks good. I added it back and commited change to CVS. Stefano