Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=57324
If it is known that the connection is going to be closed when committing the response, send the connection: close header.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1645626 13f79535-47bb-0310-9956-ffa450edef68