remove hardcoding of OGC schemas location

[tomkralidis]

In mapwcs.c, all XML root elements which point to schemas in the
xsi:schameLocation attribute hardcode to:

schemas.opengis.net

This should be picking up from the web metadata "ows_schema_locations" value,
which you can get returned from: msOWSGetSchemasLocation(map)

[sdlime]

Just fixed, thanks...

[tomkralidis]

Looks like there's one left in the ServiceException root element (mapwcs.c, line
1325), hardcoded to ogc.dmsolutions.ca.

While you're at it, the path to the schema should be:

xsi:schemaLocation=\"http://www.opengis.net/wcs
%s/wms/1.1.1/OGC-exception.xsd\">\n", msOWSGetSchemasLocation(map));

[assefa]

Fixed the last one #comment 2