webdav: switch hard-coded JGlobus paths to those configured

The WebDAV door may use either Jetty's built-in SSL support or
support coming from JGlobus.  If the latter is chosen then
various paths are hard-coded.

This does not respect a site's configuration and, as a specific
example, results in the system-test failing.

This patch switches the JGlobus WebDAV SSL connector to use
the configured path.

Patch: http://rb.dcache.org/r/5575/
Acked-by: Gerd Behrmann
Target: master
Request: 2.6