Align Alfresco, CIFS and FTP authentication stacks for NTLM passthru, kerberos and LDAP

- PassthruServerFactory created to allows PassthruServers singleton to be shared by CIFS, FTP and Alfresco passthru authenticators
- Also added NTLM + Alfresco (non-passthru) example. Doesn't seem to work yet!
- ExtendedServerConfigurationAccessor interface added BaseSSOAuthenticationFilter to get at local server name info from file server configuration
- toString() added to CIFSAuthenticator so that we can still properly log the authenticator type
- Fixed WebDAVServlet to go through ServerConfigurationAccessor interface to avoid ClassCastException

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@13823 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/webdav/WebDAVServlet.java

@@ -36,6 +36,7 @@ import javax.servlet.http.HttpServletResponse;
 import javax.transaction.UserTransaction;
 
 import org.alfresco.filesys.ServerConfigurationBean;
+import org.alfresco.jlan.server.config.ServerConfigurationAccessor;
 import org.alfresco.repo.security.authentication.AuthenticationContext;
 import org.alfresco.repo.tenant.TenantService;
 import org.alfresco.service.ServiceRegistry;
@@ -333,7 +334,7 @@ public class WebDAVServlet extends HttpServlet
 		
         // Initialize the root node
         
-        ServerConfigurationBean fileSrvConfig = (ServerConfigurationBean) context.getBean(ServerConfigurationBean.SERVER_CONFIGURATION);
+        ServerConfigurationAccessor fileSrvConfig = (ServerConfigurationAccessor) context.getBean(ServerConfigurationBean.SERVER_CONFIGURATION);
         if ( fileSrvConfig == null)
             throw new ServletException("File server configuration not available");