Merge r1685345, r1685347, r1685349 and r1685350 from trunk.

core: Allow spaces after chunk-size for compatibility with implementations
using a pre-filled buffer.

Proposed by: ylavic, trawick
Reviewed by: ylavic, wrowe, minfrin


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1687339 13f79535-47bb-0310-9956-ffa450edef68