[FIX] hr_attendance: Keep the kiosk session alive

closes #1800442

Purpose
=======

Odoo sessions are expired when no action has been triggered
for the last 7 days. For kiosk mode, this doesn’t make sense.

It means that once a week, a person with the rights to the
employee under kiosk mode, has to come to the screen and log in again.

Specification
=============

Trigger an action to keep the Odoo session alive.

addons/hr_attendance/static/src/js/kiosk_mode.js

@@ -36,6 +36,8 @@ var KioskMode = Widget.extend(BarcodeHandlerMixin, {
                 self.$el.html(QWeb.render("HrAttendanceKioskMode", {widget: self}));
                 self.start_clock();
             });
+        // Make a RPC call every day to keep the session alive
+        self._interval = window.setInterval(this._callServer.bind(this), (60*60*1000*24));
         return self._super.apply(this, arguments);
     },
 
@@ -60,8 +62,15 @@ var KioskMode = Widget.extend(BarcodeHandlerMixin, {
 
     destroy: function () {
         clearInterval(this.clock_start);
+        clearInterval(this._interval);
         this._super.apply(this, arguments);
     },
+
+    _callServer: function () {
+        // Make a call to the database to avoid the auto close of the session
+        return Session.rpc('/web/webclient/version_info', {})
+    },
+
 });
 
 core.action_registry.add('hr_attendance_kiosk_mode', KioskMode);