Add creation of TTL1 Containers to Overlay_tf.py

This merge request updates Overlay_tf.py to allow it to write out TTL1 Containers. This should mean that the output should in principle be the same as for OverlayPool_tf.py.
Added an ART test to confirm this. Once we are happy with how Overlay_tf.py is running we should adapt Reco_tf.py to use Overlay_tf.py rather than OverlayPool_tf.py.
Also fixed the Overlay_tf.py log output so that the event numbers and slots are displayed when running in AthenaMT mode.

This merge request affects 3 packages:

• Event/EventOverlay/EventOverlayJobTransforms
• Simulation/Tests/OverlayTests
• Trigger/TrigT1/TrigT1CaloSim

Adding @jchapman ,@ahaas ,@tkharlam ,@tadej ,@vpascuzz as watchers

added EDM Overlay Simulation Trigger master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-26819-2019-09-26-23-02
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 3605]

added review-approved label and removed review-pending-level-1 label

Looks good for me. Approved.--L1

merged

mentioned in commit ed22e311

added sweep:ignore label