mod_cache: Ignore response headers specified by no-cache=header and

mod_cache: Ignore response headers specified by no-cache=header and
private=header as specified by RFC2616 14.9.1 What is Cacheable. Ensure
that these headers are still processed when multiple Cache-Control
headers are present in the response. PR 54706

trunk patch: http://svn.apache.org/r1478382
2.4.x patch: http://people.apache.org/~minfrin/httpd-mod_cache-nocacheheader2.4.patch

Submitted by: minfrin
Reviewed by: jim, wrowe

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1487103 13f79535-47bb-0310-9956-ffa450edef68