Merge r1707831 from trunk:

PR 53845: Remove commented config regarding DNT because the spec now has CR status (confirming our interpretation) and MS has committed to changing their implementation: http://blogs.microsoft.com/on-the-issues/2015/04/03/an-update-on-microsofts-approach-to-do-not-track/
Submitted by: fielding
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1712265 13f79535-47bb-0310-9956-ffa450edef68