Convert 'for' loops to enhanced 'for' loops.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1557264 13f79535-47bb-0310-9956-ffa450edef68
Add missing '@Override' annotations.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/exec/trunk@1557265 13f79535-47bb-0310-9956-ffa450edef68