Merge r1707084, r1707093, r1707159, r1707362 from trunk:

eor_bucket: don't destroy the request multiple times should any filter
do a copy (e.g. mod_bucketeer).


eor_bucket: follow up to r1707084: fix comment.

eor_bucket: follow up to r1707084: use an inner shared bucket.


eor_bucket: follow up to r1707159.
We need an apr_bucket_refcount, as spotted by Ruediger.
Submitted by: ylavic
Reviewed by: icing, covener, jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1861248 13f79535-47bb-0310-9956-ffa450edef68