Update Nat Gateway SKU default to standard

Author: khannarheams

src/Network/Network/Models/PSSubnet.cs

@@ -43,7 +43,7 @@ public class PSSubnet : PSChildResource
 
         [JsonProperty(Order = 1)]
         [Ps1Xml(Label = "NatGateway Name", Target = ViewControl.Table, ScriptBlock = "$_.NatGateway.Name")]
-        public PSNatGateway NatGateway { get; set; }
+        public PSResourceId NatGateway { get; set; }
 
         [JsonProperty(Order = 1)]
         public List<PSServiceEndpoint> ServiceEndpoints { get; set; }

src/Network/Network/NatGateway/NewAzureRMNatGatewayCommand.cs

@@ -119,7 +119,7 @@ public override void Execute()
                 {
                     vSku = new PSNatGatewaySku();
                 }
-                vSku.Name = this.Sku;
+                vSku.Name = MNM.NatGatewaySkuName.Standard;
             }
 
             // PublicIpAddresses

src/Network/Network/NatGateway/RemoveAzureRMNatGatewayCommand.cs

@@ -39,7 +39,7 @@
 
 namespace Microsoft.Azure.Commands.Network
 {
-    [Cmdlet(VerbsCommon.Remove, ResourceManager.Common.AzureRMConstants.AzureRMPrefix + "NatGateway", SupportsShouldProcess = true, DefaultParameterSetName = "BackendSetByResource"), OutputType(typeof(bool))]
+    [Cmdlet(VerbsCommon.Remove, ResourceManager.Common.AzureRMConstants.AzureRMPrefix + "NatGateway", SupportsShouldProcess = true, DefaultParameterSetName = "DeleteByNameParameterSet"), OutputType(typeof(bool))]
     public partial class RemoveAzureRmNatGateway : NetworkBaseCmdlet
     {
         private const string DeleteByNameParameterSet = "DeleteByNameParameterSet";