Refs #3946 : Store execution of reports in database, add an actor to process it
Ref #3947: Add calls to new repository when needed
Fixes #3946: add a service to store and use node executions
Refs #3946: implement proper use of execution nodes reports, by minimizing the number of query to the database
Refs #3946: improve logic and comment to make the code mnd logs ore understandable
Refs #3946: change default value and implementation
Merge pull request #341 from ncharles/ust_3945/impl_3946/Add_repository_for_execution_reports

Fixes #3946 : add a service to fetch nodes executions and use them for reporting