Improvment of OutputCondAlgConfig

While working on something else I encountered a few imperfections in the properties on and config of the OutputConditionsAlg, some of older than a decade.

This MR:

• Change the property name RUN2 to Run2 to be consistent with Run1 (this denotes the validity range, not the LHC period!)
• Update the only two clients I found in the repository
• Change the default of the property WriteIOV to true. (False means write a POOL file but no sqlite file. Makes no sense any more)
• Update (new-style) OutputConditionsAlgConfig to use kwargs syntax.