NET-551 Util copyReader calls CopyStreamListener.bytesTransferred with the incorrect value for bytesTransferred

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/net/trunk@1616574 13f79535-47bb-0310-9956-ffa450edef68
NET-551 Util copyReader calls CopyStreamListener.bytesTransferred with the incorrect value for bytesTransferred
Rename confusing fields

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/net/trunk@1616578 13f79535-47bb-0310-9956-ffa450edef68