AthenaConfiguration: Factor out AppMgr creation in ComponentAccumulator.

Factor the code to create the AppMgr out of ComponentAccumulator.run into a separate function. This then allows one to call the event loop functions interactively. Mostly for debugging purposes.

This merge request affects 1 package:

• Control/AthenaConfiguration

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20526-2019-01-22-22-51
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 32549] (for remote access see the FAQ for MR reviewers)

merged

mentioned in commit cd1ee4e7

added sweep:ignore label