TriggerAPI: explicitly pass ConfigFlags when needed

Frank Winklmeierrequested to merge
fwinkl/athena:triggerapi into master

For "future" run periods, the menu name needs to be specified via the ConfigFlags. To avoid wide-ranging interface changes, a new TriggerAPI.setConfigFlags method is added that can be used to specificy the flags when needed.

cc @jmontejo @tadej

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