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

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1432550 13f79535-47bb-0310-9956-ffa450edef68
Add missing '@Override' annotations.
Add missing '@Deprecated' annotations.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1432551 13f79535-47bb-0310-9956-ffa450edef68
Add final modifier to private fields.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1432552 13f79535-47bb-0310-9956-ffa450edef68