load the store later, move non-dynamic properties and methods to class body

this fixes two problems:
 * we were loading the store before the parent ComboGrid class could put
  a listener on the load event
  * displayField must now be set in class body, take opportunity to move out
  what we can of the mega initComponent()

this two fixes allow the HA GroupEdit  Window to properly display the
existing members of a HA Group when editing group membership

www/manager6/form/NodeSelector.js

@@ -10,12 +10,10 @@ Ext.define('PVE.form.NodeSelector', {
     // only allow those nodes (array)
     allowedNodes: undefined,
 
-    initComponent: function() {
-	var me = this;
-
-	var store = Ext.create('Ext.data.Store', {
+    valueField: 'node',
+    displayField: 'node',
+    store: {
 	    fields: [ 'node', 'cpu', 'maxcpu', 'mem', 'maxmem', 'uptime' ],
-	    autoLoad: true,
 	    proxy: {
 		type: 'pve',
 		url: '/api2/json/nodes'
@@ -30,12 +28,8 @@ Ext.define('PVE.form.NodeSelector', {
 		    direction: 'DESC'
 		}
 	    ]
-	});
+	},
 
-	Ext.apply(me, {
-	    store: store,
-	    valueField: 'node',
-	    displayField: 'node',
     listConfig: {
 	columns: [
 	    {
@@ -59,10 +53,12 @@ Ext.define('PVE.form.NodeSelector', {
 		width: 100,
 		dataIndex: 'cpu'
 	    }
-		]
+	],
     },
+
     validator: function(value) {
 	/*jslint confusion: true */
+	var me = this;
 	if (!me.onlineValidator || (me.allowBlank && !value)) {
 	    return true;
 	}
@@ -87,13 +83,16 @@ Ext.define('PVE.form.NodeSelector', {
 	    return "Node " + offline.join(', ') + " seems to be offline!";
 	}
 	return true;
-	    }
-	});
+    },
+
+    initComponent: function() {
+	var me = this;
 
         if (me.selectCurNode && PVE.curSelectedNode.data.node) {
             me.preferredValue = PVE.curSelectedNode.data.node;
         }
 
         me.callParent();
+        me.getStore().load();
     }
 });