@Override
    public ManagerConfigurator<ENTITY>
    withParallelStrategy(ParallelStrategy parallelStrategy) {
        this.strategy = requireNonNull(parallelStrategy);
        return this;
    }
Default implementation of {@link ManagerConfigurator} that allows a new
default {@link ParallelStrategy} to be set in the delegating {@link Manager}.

@param <ENTITY> Entity type

@author Per Minborg
@since  3.0.1
runtime-parent/runtime-core/src/main/java/com/speedment/runtime/core/internal/manager/ManagerConfiguratorImpl.java