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.

Backport of modules/dav/fs/dbm.c r1.29 from httpd-2.1
PR:		11637
Submitted by:	Amit Athavale <amit_athavale@persistent.co.in>
Reviewed by:	Joe Orton, Jeff Trawick, Justin Erenkrantz


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@102114 13f79535-47bb-0310-9956-ffa450edef68