Add a "default-handler" handler that calls the default_hander()

function which is normally called for static content.  This allows
you to override a specific handler.  This is not a complete solution to
being able to "unconfigure" things as asked for in PR#2979, but it is
still useful.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@82288 13f79535-47bb-0310-9956-ffa450edef68