[20.10 backport] fix innocuous data-race when config.Load called in parallel #3410
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backport of #3264
relates to / follow-up to / introduced in:
Locking was removed in #3025 which
allows for parallel calls to config.Load to modify global state.
The consequence in this case is innocuous, but it does trigger a
DATA RACE
exception when tests run with-race
option.