AthenaKernel: Address potential data race.

Make CondCont::m_keyType atomic.

This merge request affects 1 package:

• Control/AthenaKernel

Adding @ssnyder ,@rbianchi as watchers

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-20854-2019-02-03-10-26
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
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added review-approved label and removed review-pending-level-1 label

mentioned in commit a98850b0

merged

added sweep:ignore label