CxxUtils: Fix thread-safety checker warnings.

The thread-safety checker wasn't property checking class constructors. Fix a few warnings that appear once that is corrected.

This merge request affects 1 package:

• Control/CxxUtils

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20200-2019-01-08-05-56
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 31966] (for remote access see the FAQ for MR reviewers)

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

merged

mentioned in commit 11f3e2e5

added sweep:ignore label