Backward compatible changes to prepare for Gaudi new JobOptionsSvc

These backward compatible changes are needed to make the code compatible with Gaudi versions before and after v34r0, in particular they are required by gaudi/Gaudi!577 (merged), which is going to be merged soon.

mentioned in merge request gaudi/Gaudi!577 (merged)

• [2020-07-15 22:31] Validation started with lhcb-master-mr#1087
• [2020-07-17 12:33] Validation started with lhcb-master-mr#1093

/ci-test

mentioned in merge request Rec!2139 (merged)

assigned to @msaur

assigned to @jonrob

resolved all threads

merged

mentioned in commit 36e5b719

unassigned @jonrob and @msaur

mentioned in merge request Phys!746 (merged)

mentioned in issue Moore#198 (closed)

mentioned in merge request !2662 (merged)

mentioned in issue Moore#200 (closed)

added Calo Persistency modernisation labels

mentioned in merge request Rec!2362 (merged)