Back off a portion of the incremental-IndexOptions patch;
	unprefixed keywords should clear all inherited options and
	start setting the local directory's options from scratch.
	Otherwise, 'keyword' and '+keyword' are essentially identical,
	and clearing inheritance a pain.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@82194 13f79535-47bb-0310-9956-ffa450edef68