force having a voms proxy for any scheduler, since it is needed to talk to cmsweb. Fix #1224
proy check moved to Scheduler.py fix for #1124
 exit immediately and tell if user is trying to use crab server #1226
only myproxy.cern.ch can be used as myproxy server, see #1224
only myproxy.cern.ch can be used as myproxy server, see #1224
only myproxy.cern.ch can be used as myproxy server, see #1224
 deal with PNN's missing in SiteDB PNN to PSN map #1225
2_11_1_patch1_pre1
Merge pull request #1227 from belforte/master

2_11_1_patch1_pre1