* new configservice.jsp page that shuts down the router (and has hooks for a few other things)

* new safer way of shutting down the router per discussions with oOo (dealing with a graceful
shutdown where the user updates their config before the shutdown is complete, etc)
* graceful shutdown implemented in the router - shutdownGracefully(), cancelGracefulShutdown(), shutdownInProgress()

apps/routerconsole/java/src/net/i2p/router/web/ConfigServiceHandler.java

@@ -0,0 +1,46 @@
+package net.i2p.router.web;
+
+import net.i2p.router.ClientTunnelSettings;
+
+/**
+ * Handler to deal with form submissions from the service config form and act
+ * upon the values.
+ *
+ */
+public class ConfigServiceHandler extends FormHandler {
+    private String _action;
+    private String _nonce;
+    
+    public void ConfigNetHandler() {
+        _action = null;
+        _nonce = null;
+    }
+    
+    protected void processForm() {
+        if (_action == null) return;
+        if (_nonce == null) {
+            addFormError("You trying to mess with me?  Huh?  Are you?");
+            return;
+        }
+        String nonce = System.getProperty(ConfigServiceHandler.class.getName() + ".nonce");
+        String noncePrev = System.getProperty(ConfigServiceHandler.class.getName() + ".noncePrev");
+        if ( (!_nonce.equals(nonce)) && (!_nonce.equals(noncePrev)) ) {
+            addFormError("Invalid nonce?  Hmmm, someone is spoofing you.  prev=["+ noncePrev + "] nonce=[" + nonce + "] param=[" + _nonce + "]");
+            return;
+        }
+        if ("Shutdown gracefully".equals(_action)) {
+            _context.router().shutdownGracefully();
+            addFormNotice("Graceful shutdown initiated");
+        } else if ("Shutdown immediately".equals(_action)) {
+            _context.router().shutdown();
+            addFormNotice("Shutdown immediately!  boom bye bye bad bwoy");
+        } else if ("Cancel graceful shutdown".equals(_action)) {
+            _context.router().cancelGracefulShutdown();
+            addFormNotice("Graceful shutdown cancelled");
+        } else {
+            addFormNotice("Blah blah blah.  whatever.  I'm not going to " + _action);
+        }
+    }
+    public void setAction(String action) { _action = action; }
+    public void setNonce(String nonce) { _nonce = nonce; }
+}