Simplify code.
There is no need to iterate over parts and cleanup them, Tomcat takes care of that in Request.recycle().

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1565416 13f79535-47bb-0310-9956-ffa450edef68
Update Commons DBCP snapshot

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1565422 13f79535-47bb-0310-9956-ffa450edef68
Changelog entry for r1565300, r1565416.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1565424 13f79535-47bb-0310-9956-ffa450edef68