Merge r1297958 from trunk:

PR52845: "DirectoryIndex disabled" should blow away the DirectoryIndex settings
in the current config section, not just override previous config sections.

Submitted by: covener
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1300089 13f79535-47bb-0310-9956-ffa450edef68