ATLAS_CHECK_THREAD_SAFETY fixes in xAODTruth

Some relatively trivial (const corectness ) fixes for xAODTruth

This merge request affects 1 package:

• Event/xAOD/xAODTruth

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-20768-2019-01-30-23-30
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
CI Jenkins server is switched to https://atlas-sit-ci.cern.ch. It is accessible world-wide (behind CERN SSO). In old links to Jenkins server aibuild080.cern.ch:8080 should be replaced with atlas-sit-ci.cern.ch For experts only: Jenkins output [CI-MERGE-REQUEST 33039]

The changes look ok. Adding review-approved label.

L1 shifter

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

merged

mentioned in commit 59b033df

added sweep:ignore label