CaloTriggerTool: Use AthMessaging in LArTTCellMap.

Use AthMessaging in LArTTCellMap. In passing, fix cppcheck warnings.

This merge request affects 2 files:

• Calorimeter/CaloTriggerTool/CaloTriggerTool/LArTTCellMap.h
• Calorimeter/CaloTriggerTool/src/LArTTCellMap.cxx

Adding @pavol as watcher

added Calorimeter JetEtmiss Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash c4a78847)

	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 23272]

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

merged

mentioned in commit 39f38ab1

added sweep:ignore label