back-port of configBuilder to handle DQMIO
relval matrix uses DQMIO for workflow injection to production. --revertDqmio=yes available if one needs to use old DQM
DQMIO in upgradeKeys for upgrade-specific HARVESRTING step
back port the last DQMIO features to 620_SLHC
Merged refs/pull/5663/head from repository cms-sw
temporary fix to a failure when merging histograms
Merge pull request #5683 from deguio/DQMIO_620_SLHC

Dqmio 620 slhc