Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=50496

Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=50496
Differentiate between content written (what the app writes to the output stream) and bytes written (what Tomcat writes to the socket) and use bytes for the access logs

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1056298 13f79535-47bb-0310-9956-ffa450edef68