updated to deal with the migration of CouchDB server (LBCORE-944)

Marco Clemencicrequested to merge
clemenci/LbNightlyTools:LBCORE-944 into master
  • modified cron/clean_up_reduced_db.sh to work on lbcouchdb.cern.ch too
  • modified the URLs to point to lhcb-nightlies.cern.ch or lbcouchdb.cern.ch, depending on the use case)
  • updated documentation

Fixes LBCORE-944.

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