PLT-3237 Update displayed config values in admin console after saving (#3506)

* Reloaded admin console data when settings are saved

* Fixed attempting to save an invalid config setting overwriting the stored config

webapp/components/admin_console/developer_settings.jsx

@@ -15,11 +15,6 @@ export default class DeveloperSettings extends AdminSettings {
         this.getConfigFromState = this.getConfigFromState.bind(this);
 
         this.renderSettings = this.renderSettings.bind(this);
-
-        this.state = Object.assign(this.state, {
-            enableTesting: props.config.ServiceSettings.EnableTesting,
-            enableDeveloper: props.config.ServiceSettings.EnableDeveloper
-        });
     }
 
     getConfigFromState(config) {
@@ -29,6 +24,13 @@ export default class DeveloperSettings extends AdminSettings {
         return config;
     }
 
+    getStateFromConfig(config) {
+        return {
+            enableTesting: config.ServiceSettings.EnableTesting,
+            enableDeveloper: config.ServiceSettings.EnableDeveloper
+        };
+    }
+
     renderTitle() {
         return (
             <h3>