Add ids to admin dropdown button, switch team button and logout button (#5973)

* Add ids to admin dropdown button, switch team button and logout button

For selenium automation - update the admin setting and switch to specific team or logout

* updated the team nav button based on the suggestion

webapp/components/admin_console/admin_navbar_dropdown.jsx

@@ -15,6 +15,8 @@ import {Link} from 'react-router/es6';
 
 import React from 'react';
 
+import * as Utils from 'utils/utils.jsx';
+
 export default class AdminNavbarDropdown extends React.Component {
     constructor(props) {
         super(props);
@@ -71,6 +73,7 @@ export default class AdminNavbarDropdown extends React.Component {
                 teams.push(
                     <li key={'team_' + team.name}>
                         <Link
+                            id={'swithTo' + Utils.createSafeId(team.name)}
                             to={'/' + team.name + '/channels/town-square'}
                         >
                             <FormattedMessage
@@ -113,6 +116,7 @@ export default class AdminNavbarDropdown extends React.Component {
                 >
                     <a
                         href='#'
+                        id='adminNavbarDropdownButton'
                         className='dropdown-toggle admin-navbar-dropdown__toggle'
                         data-toggle='dropdown'
                         role='button'
@@ -136,6 +140,7 @@ export default class AdminNavbarDropdown extends React.Component {
                         <li>
                             <a
                                 href='#'
+                                id='logout'
                                 onClick={() => GlobalActions.emitUserLoggedOutEvent()}
                             >
                                 <FormattedMessage