StorageSvc+RootStorageSvc: Fix clang warnings.

Missing override keywords.

This merge request affects 2 packages:

• Database/APR/RootStorageSvc
• Database/APR/StorageSvc

Affected files list will not be printed in this case

Adding @mnowak ,@ssnyder as watchers

added Database master review-pending-level-1 labels

CI Result FAILURE (hash 49677727)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
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
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 45848]

Changes look good from L1 point of view. AMI issue is unrelated (see ATLASAMI-278) - Approving.

Cheers, Steffen (L1)

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit dfb6c855

added sweep:ignore label