xAODTracking, fix 1st the trivial warnings from THREAD_SAFETY_CHECKER ,ATLASRECTS-3315

Mentioning @and @akraszna that might be looking also to these.

Anyhow, the THREAD_SAFETY_CHECKER gives a lot of warnings on this package. It will probably take another 2 MRs to figure out the best solutions for the 3 mutable (1 NeutralParameters 2 Vertex, and the 2 static in the NeutralParameter not obvious especially for the DefiningParameter methods of the Neutal ... )

This fixes the trivial ones --> static Accessor , static const Accessor so to get them out of the way

Mentioning @goetz @emoyse @mhodgkin in case they know if someone else is looking on this or have ideas

This merge request affects 2 packages:

• Event/xAOD/xAODMuon
• Event/xAOD/xAODTracking

Adding @rbianchi as watcher

added EDM master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20671-2019-01-26-20-06
Athena: number of compilation errors 0, warnings 29
AthSimulation: number of compilation errors 0, warnings 0
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Looks OK. Approving.

Tadej (L1)

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

merged

mentioned in commit c2689153

added sweep:ignore label

changed title from xAODTracking, fix 1st the trivial warnings from THREAD_SAFETY_CHECKER to xAODTracking, fix 1st the trivial warnings from THREAD_SAFETY_CHECKER ,ATLASRECTS-3315

changed the description