Merge r1773397 from trunk:

ProxyPass ! doesn't block per-directory ProxyPass

 *) mod_proxy: Honor a server scoped ProxyPass exception when ProxyPass is
     configured in <Location>, like in 2.2. PR 60458.
     [Eric Covener]


Submitted by: covener
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1773800 13f79535-47bb-0310-9956-ffa450edef68