Fix a problem with namespace mappings being dropped in mod_dav_fs;

if any property values were set which defined namespaces these
came out mangled in the PROPFIND response.

PR:            11637
Submitted by:  Amit Athavale <amit_athavale@persistent.co.in>
Reviewed by:   Joe Orton, Jeff Trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@99690 13f79535-47bb-0310-9956-ffa450edef68