fix(console): the console page connects only to the panel's own proxy

- The lite VNC page took the proxy's host, port and path from its link. A
  link naming another host made the page send that host a fresh signed
  console token, which opened the VM's console for two minutes. The page
  now uses only what the server gives it, like the full page.
- On a local-socket host, a VM whose console listens on 127.0.0.1 is
  reached directly instead of being refused for want of an SSH tunnel.
- A shut-off VM's console says that the VM is not running instead of
  failing with no reason.

console/views.py

@@ -105,7 +105,9 @@ def console(request):
         console_type = conn.get_console_type()
         console_websocket_port = conn.get_console_websocket_port()
         console_passwd = conn.get_console_passwd()
+        running = conn.instance.isActive()
     except (libvirtError, ValueError, IndexError, Instance.DoesNotExist):
+        running = False
         console_type = None
         console_websocket_port = None
         console_passwd = None
@@ -124,7 +126,10 @@ def console(request):
     if ws_path:
         ws_path = ws_path.strip("/") + "/" if ws_path.strip("/") else ""
 
-    if console_type == "vnc":
+    if console_type and not running:  # a shut-off VM has no console to connect to
+        console_error = _("The VM is not running: start it to open its console.")
+        response = render(request, "console-vnc-lite.html", locals())
+    elif console_type == "vnc":
         console_page = "console-vnc-" + view_type + ".html"
         response = render(request, console_page, locals())
     elif console_type == "pty" and not settings.SERIAL_CONSOLE_ENABLED: