AthenaConfiguration: Remove Py2 code and fix logging calls

Remove the usage of six for Py2 compatibility, tidy up dict loops and comprehensions and fix all logging calls to use lazy string formatting.

Running this with full-unit-tests. Shifters, please compare failures to nightly build.

added full-unit-tests label

This merge request affects 5 files:

• Control/AthenaConfiguration/CMakeLists.txt
• Control/AthenaConfiguration/python/AthConfigFlags.py
• Control/AthenaConfiguration/python/ComponentAccumulator.py
• Control/AthenaConfiguration/python/Deduplication.py
• Control/AthenaConfiguration/python/PropSetterProxy.py

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result FAILURE (hash d24cd4f8)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 22855]

Unrelated test failures.

Looks OK, approving.

Tadej (L2)

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

merged

mentioned in commit 9b5a4109

added sweep:ignore label