Merge r1837250 from trunk:

If ProxyPassReverse is used for reverse mapping of relative redirects, subsequent ProxyPassReverse statements, whether they are relative or absolute, may fail.

PR 60408 [Peter Haworth <pmh1wheel gmail.com>]
Submitted by: jailletc36
Reviewed by: jailletc36, rpluem, jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1846044 13f79535-47bb-0310-9956-ffa450edef68