MAGETWO-32484: Stabilization of changes and bug fixing

- Use registry to make sure that adminSystemConfig is defined

app/code/Magento/Backend/view/adminhtml/templates/system/config/edit.phtml

@@ -25,27 +25,14 @@
 <script>
 require([
     "jquery",
+    "Magento_Ui/js/lib/registry/registry",
     "jquery/jquery.hashchange",
     "mage/mage",
-    "prototype"
-], function(jQuery){
+    "prototype",
+    "domReady!"
+], function(jQuery, registry){
 
-    jQuery(function() {
-        window.configForm = jQuery('#config-edit-form').mage('form').mage('validation', {
-            submitHandler: function(form)
-            {
-                $$('.requires').each(function(element) {
-                    var scopeElement = adminSystemConfig.getScopeElement(element);
-                    if (!scopeElement || !scopeElement.checked) {
-                        Element.extend(element).disabled = false;
-                    }
-                });
-                jQuery(form).trigger('afterValidate');
-                form.submit();
-            }
-        });
-
-        window.adminSystemConfig = {
+    var adminSystemConfig = {
         getUp: function (element, tag) {
             var $element = Element.extend(element);
             if (typeof $element.upTag == 'undefined') {
@@ -213,6 +200,19 @@ require([
         }
     };
 
+    window.configForm = jQuery('#config-edit-form').mage('form').mage('validation', {
+        submitHandler: function(form)
+        {
+            $$('.requires').each(function(element) {
+                var scopeElement = adminSystemConfig.getScopeElement(element);
+                if (!scopeElement || !scopeElement.checked) {
+                    Element.extend(element).disabled = false;
+                }
+            });
+            jQuery(form).trigger('afterValidate');
+            form.submit();
+        }
+    });
 
     $$('.shared').each(function(element){
         Event.observe(element, 'change', adminSystemConfig.onchangeSharedElement);
@@ -348,8 +348,6 @@ require([
     jQuery(window).hashchange(handleHash);
     handleHash();
 
-    });
-    
-    jQuery(window).load(function(){jQuery('body').trigger('adminConfigDefined')})
+    registry.set('adminSystemConfig', adminSystemConfig);
 });
 </script>