Merge of r1779979,1780159,1780576,1780596 from trunk:
M    modules/http2/h2_bucket_beam.c
     fix for possible duplicate free of send/recv pools
M    modules/http2/h2_from_h1.c
     suppress generating responses on aborted slave connections
M    modules/http2/h2_session.c
     regression: stream ongoing streams on graceful shutdown to the end
M    modules/http2/h2_version.h



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1780597 13f79535-47bb-0310-9956-ffa450edef68