Handle xrootd settings and T2_CH_CERN_HLT special case automatically

[haozturk]

Currently, for a given failed task, console brings the sites in a pre-selected manner according to the info coming from ACDC server. There are a few things that the operator needs to do upon that. We want console to handle them automatically. Here is the desired procedure:

• For a given failed task, if there is a necessary site which is drain (marked as red and bold letters in the console):
  • Pre-select primary xrootd (don't touch the secondary xrootd at any step)
  • If either T2_CH_CERN or T2_CH_CERN_HLT is among the pre-selected sites, unselect them
  • It would be good to display a small message if console does this procedure in order to make it clear for new operators etc. It could be something like There is a necessary site in drain, therefore enabling xrootd. Since xrootd is enabled, unselecting CERN and HLT since HLT cannot perform remote reads. We unselect CERN too, since jobs sent to CERN can be redirected to HLT internally