xAODEventInfoCnv, etc: Migrate xAODEventInfoCnvTool to use LuminosityCondAlg.
Migrate xAODEventInfoCnvTool from using LuminosityTool to LuminosityCondAlg.
Add a configuration fragment, xAODEventInfoCnvAlgDefault, which will set up the luminosity conditions algorithm; it also disables running the algorithm at BeginRun.
In passing, resolves ToolHandle constness issues.
Allow passing EventContext to IEventInfoCnvTool::convert().
RecExCommon: Use configuration fragment for xAOD::EventInfoCnvAlg, rather than doing it by hand. Needed to get luminosity configured.