Backport.

Backport.

* STATUS

  Remove vote.

* CHANGES
* docs/manual/mod/mod_cache.xml
* modules/experimental/cache_util.c
* modules/experimental/mod_cache.c
* modules/experimental/mod_cache.h
* modules/experimental/mod_mem_cache.c
* modules/experimental/mod_disk_cache.c

  Add CacheIgnoreHeaders directive.
  PR: 30399
    docs/manual/mod/mod_cache.xml: r1.18
    modules/experimental/cache_util.c: 1.36
    modules/experimental/mod_cache.c: 1.95
    modules/experimental/mod_cache.h: 1.52
    modules/experimental/mod_disk_cache.c: 1.67
    modules/experimental/mod_mem_cache.c: 1.119
      +1: jerenkrantz, stoddard, striker
      +0: sounds like a nice 'feature' v.s. rfc-required behavior, great for 2.2

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@160771 13f79535-47bb-0310-9956-ffa450edef68