DefaultThreadPool causes warning when minPoolSize == 0

DefaultThreadPool inappropriately emits a warning when a pool has a min pool size of 0.

A min pool size of 0 is supported by the downstream ThreadExpiringThreadPool, and is logically useful when 'empty' is a reasonable size of a pool, e.g. when no work is apriori expected for the pool.
The code in question is:
// Min pool size
if (this.configuration.getMinPoolSize() < 1)

{ this.configuration.setMinPoolSize(1); this.logger.warn("min-pool-size < 1 for pool \"" + this.name + "\". Set to 1"); }

The downstream code in ThreadExpiringThreadPool only enforces this value is >= 0.