allow edits to dhcptoptions and vnet format fix

Author: deepakswifty

src/ResourceManager/Network/Commands.Network/Microsoft.Azure.Commands.Network.format.ps1xml

@@ -44,11 +44,11 @@
               </ListItem>
               <ListItem>
                 <Label>DhcpOptions</Label>
-                <PropertyName>DhcpOptionsTest</PropertyName>
+                <PropertyName>DhcpOptionsText</PropertyName>
               </ListItem>
               <ListItem>
                 <Label>NetworkInterfaces</Label>
-                <PropertyName>NetworkInterfacesTest</PropertyName>
+                <PropertyName>NetworkInterfacesText</PropertyName>
               </ListItem>
               <ListItem>
                 <Label>Subnets</Label>

src/ResourceManager/Network/Commands.Network/VirtualNetwork/VirtualNetworkBaseCmdlet.cs

@@ -64,6 +64,8 @@ public PSVirtualNetwork GetVirtualNetwork(string resourceGroupName, string name)
             virtualNetwork.Tag =
                 TagsConversionHelper.CreateTagHashtable(getNetworkInterfaceResponse.VirtualNetwork.Tags);
 
+            virtualNetwork.DhcpOptions = new PSDhcpOptions();
+
             return virtualNetwork;
         }