PLT-2257 Reorganized System Console (#3003)

* Reorganized system console

* Fixed the names of some components

* Fixed timestamp for BrandImageSetting

* Fixed merge issues

* Updated push notification settings to match master branch

* Removed top level setting pages and moved enable Gitlab/LDAP settings onto their respective pages

* Re-added restrictDirectMessage setting to system console

* Re-added email connection test and fixed some margins

* Fixed ESLint errors

* Renamed Authentication > Onboarding to Authentication > Email in the system console

* Renamed Customization > Whitelabeling to Customization > Custom Branding in System Console

* Re-added EnableOpenServer to system console

webapp/components/admin_console/admin_console.jsx

@@ -0,0 +1,61 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import $ from 'jquery';
+import React from 'react';
+
+import AdminStore from 'stores/admin_store.jsx';
+import * as AsyncClient from 'utils/async_client.jsx';
+
+import AdminSidebar from './admin_sidebar.jsx';
+
+export default class AdminConsole extends React.Component {
+    static get propTypes() {
+        return {
+            children: React.PropTypes.node.isRequired
+        };
+    }
+
+    constructor(props) {
+        super(props);
+
+        this.handleConfigChange = this.handleConfigChange.bind(this);
+
+        this.state = {
+            config: AdminStore.getConfig()
+        };
+    }
+
+    componentWillMount() {
+        AdminStore.addConfigChangeListener(this.handleConfigChange);
+        AsyncClient.getConfig();
+    }
+
+    componentWillUnmount() {
+        AdminStore.removeConfigChangeListener(this.handleConfigChange);
+    }
+
+    handleConfigChange() {
+        this.setState({
+            config: AdminStore.getConfig()
+        });
+    }
+
+    render() {
+        if ($.isEmptyObject(this.state.config)) {
+            return <div className='admin-console'/>;
+        }
+
+        // not every page in the system console will need the config, but the vast majority will
+        const children = React.cloneElement(this.props.children, {
+            config: this.state.config
+        });
+
+        return (
+            <div className='admin-console'>
+                <AdminSidebar/>
+                {children}
+            </div>
+        );
+    }
+}