GUAC-1053: Create session management tab.

guacamole/src/main/webapp/app/settings/templates/settings.html

@@ -35,5 +35,6 @@ THE SOFTWARE.
     <!-- Selected tab -->
     <guac-manage-users       ng-if="activeTab === 'users'"></guac-manage-users>
     <guac-manage-connections ng-if="activeTab === 'connections'"></guac-manage-connections>
+    <guac-manage-sessions    ng-if="activeTab === 'sessions'"></guac-manage-sessions>
 
 </div>