Config. expert options not being picked up due to legacy "Debug/" paths (causes crash in nwaytest.ecl)

Cloud introduced "expert" options, configurable via helm values chart.
Most existing options were picked up automatically from this section in container mode, or from legacy "Debug/" in bare metal, however, a number of places had "Debug/" hard-wired and did not pick up options from "expert/" in container mode.

One of the consequences of that, was that strandBlockSize was not being configured properly (the default), causing stranding issues in some cases (regression suite query nwaytest.ecl crashed)