Merge r1688536 and r1688538 from trunk.

http: follow up to r1685345, also needed in 2.4.x/2.2.x by r1686271/r1687339.
Handle reentrance of state BODY_CHUNK_CR to avoid AH02901 when we eat BWS
from multiple reads.

http: follow up to r1685345.
Be lenient up to 10 (room for 32bit decimals) Bad White Spaces (BWS)
between chunk-size and chunk-ext/CRLF.

Submitted by: ylavic
Reviewed by: ylavic, jim, wrowe


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1689821 13f79535-47bb-0310-9956-ffa450edef68