Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56400
Switch to svn copy for DBCP2 and Pool2

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1593563 13f79535-47bb-0310-9956-ffa450edef68
Better change log entry for DBCP changes

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1593564 13f79535-47bb-0310-9956-ffa450edef68