Fix unsafe dqmed analyzers for710pre6

new layer class (thread_unsafe::DQMEDAnalyzer) now available. the classes which use unsafe ES products which have already migrated to the DQMEDAnalyzer interface have been modified to inherit from this new class in order:
- not to loose the work done by the developers
- not to brake the threaded IB

the following pull requests are superseeded by this one:
- #3158
- #3049
- #3178