ui: do not send conserve mode on L2 network offering creation from the UI (apache#2694)

Do not send conserve mode param on L2 network offering creation from the UI. Fix config drive NPE issue on L2 network.

Author: nvazquez

engine/storage/configdrive/src/org/apache/cloudstack/storage/configdrive/ConfigDriveBuilder.java

@@ -286,7 +286,7 @@ private static void buildOpenStackMetaData(JsonObject metaData, String dataType,
         if (!NetworkModel.METATDATA_DIR.equals(dataType)) {
             return;
         }
-        if (StringUtils.isNotBlank(content)) {
+        if (StringUtils.isEmpty(content)) {
             return;
         }
         //keys are a special case in OpenStack format

ui/scripts/configuration.js

@@ -2412,14 +2412,17 @@
                                             if ($useVpcCb.is(':checked')) { //if useVpc is checked,
                                                 $useVpcCb.removeAttr("checked"); //remove "checked" attribute in useVpc
                                             }
+                                            $conservemode.css('display', 'inline-block');
                                         } else if ($guestTypeField.val() == 'Isolated') { //Isolated network offering
                                             $useVpc.css('display', 'inline-block');
                                             $supportedServices.css('display', 'inline-block');
                                             $userDataL2.hide();
+                                            $conservemode.css('display', 'inline-block');
                                         } else if ($guestTypeField.val() == 'L2') {
                                             $useVpc.hide();
                                             $supportedServices.hide();
                                             $userDataL2.css('display', 'inline-block');
+                                            $conservemode.hide();
                                         }
                                         var $providers = $useVpcCb.closest('form').find('.dynamic-input select[name!="service.Connectivity.provider"]');
                                         var $optionsOfProviders = $providers.find('option');
@@ -3403,6 +3406,9 @@
                                     } else {
                                         delete inputData.serviceProviderList;
                                     }
+
+                                    //Conserve mode is irrelevant on L2 network offerings as there are no resources to conserve, do not pass it, true by default on server side
+                                    delete inputData.conservemode;
                                 }
 
                                 if (inputData['forvpc'] == 'on') {
@@ -3411,10 +3417,12 @@
                                     delete inputData.forvpc; //if forVpc checkbox is unchecked, do not pass forVpc parameter to API call since we need to keep API call's size as small as possible (p.s. forVpc is defaulted as false at server-side)
                                 }
 
-                                if (inputData['conservemode'] == 'on') {
-                                    delete inputData.conservemode; //if ConserveMode checkbox is checked, do not pass conservemode parameter to API call since we need to keep API call's size as small as possible (p.s. conservemode is defaulted as true at server-side)
-                                } else {
-                                    inputData['conservemode'] = false;
+                                if (inputData['guestIpType'] == "Shared" || inputData['guestIpType'] == "Isolated") {
+                                    if (inputData['conservemode'] == 'on') {
+                                        delete inputData.conservemode; //if ConserveMode checkbox is checked, do not pass conservemode parameter to API call since we need to keep API call's size as small as possible (p.s. conservemode is defaulted as true at server-side)
+                                    } else {
+                                        inputData['conservemode'] = false;
+                                    }
                                 }
 
                                 // Make service provider map