Always use blocks.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/pool/trunk@1622035 13f79535-47bb-0310-9956-ffa450edef68
Convert 'for' loops to enhanced 'for' loops.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/pool/trunk@1622039 13f79535-47bb-0310-9956-ffa450edef68