use DQMIO instead of DQM data tier

Also remove the need to configure data tiers ALCARECO and DQM for express processing. The former is redundant as alca_producers is specified already, the latter is replaced with a write_dqm option that is either True or False (and configures the system for the DQMIO data tier).
Merge pull request #4105 from hufnagel/enable-dqmio

use DQMIO instead of DQM data tier