IOVSvc+AthenaKernel: Fix ubsan warning; general cleanup.

Remove releaseTool calls from finalize(). They're not really needed, and it's possible for the tools to be deleted before this is called, which results in warnings from the ub sanitizer. Should fix test failure in CSC_Digitization.

Also do some general cleanup.

This merge request affects 2 packages:

• Control/AthenaKernel
• Control/IOVSvc

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-23602-2019-05-22-09-58
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 38779]

Unrelated compilation warning, approving.

Tadej (L2)

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

mentioned in commit bffbbad5

merged

added sweep:ignore label