rework of output handling on stream/session close, rework of cleartext (http:)...

rework of output handling on stream/session close, rework of cleartext (http:) output to pass buckets to core filters, splitting of stream/io memory pools for stability and less sync

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1712300 13f79535-47bb-0310-9956-ffa450edef68