Valkyrie+LArMonitoring: Fix flake8 py3 warnings

• except clause syntax
• xrange -> range

This merge request affects 2 packages:

• Control/Valkyrie
• LArCalorimeter/LArMonitoring

Adding @pavol ,@ssnyder as watchers

added Core JetEtmiss LAr master review-pending-level-1 labels

CI Result SUCCESS (hash e08171bb)

	Athena	AthSimulation
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 7272]

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

merged

mentioned in commit 979c3544

added sweep:ignore label