Update on tau trigger DQM tool

This pull request contains a major update on the tau trigger DQM tool. Main improvements are
- Remove dependence on event content of HLTMON stream (works even with AOD now)
- Replace "automatic configuration" tool for selecting actual HLT paths with regular expressions explicitly specified in the python configuration
- Consumes-API migration
- Complete overhaul of histograms, e.g.
  - Monitor tau efficiencies for each path, and for L2 and L3 separately
  - Consistent trigger object - offline object (deltaR) matching in all relevant histograms
  - Improve binning, axis labels etc.

Also the tau trigger release validation configurations have been updated to reflect these changes. The commits are rebased on top of CMSSW_7_0_0_pre4.