Fix issue where "Dependencies don't flow from new NETStandard project".

It was not able to find the DNS assembly
dotnet/sdk#901

Author: rburgstaler

IISUtilCmd/IISUtilCmd.csproj

@@ -4,6 +4,7 @@
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+	<RestoreProjectStyle>PackageReference</RestoreProjectStyle>
     <ProjectGuid>{F5A924B7-B11A-47DB-9E8A-3973154C6641}</ProjectGuid>
     <OutputType>Exe</OutputType>
     <RootNamespace>IISUtilCmd</RootNamespace>
@@ -59,6 +60,10 @@
     <None Include="App.config" />
   </ItemGroup>
   <ItemGroup>
+    <ProjectReference Include="..\..\ACMEClientSolution\ACMEClientLib\ACMEClientLib.csproj">
+      <Project>{7c9b04f5-3783-4465-a03e-9a5026d5c079}</Project>
+      <Name>ACMEClientLib</Name>
+    </ProjectReference>
     <ProjectReference Include="..\ext\IISConfigTool\IISConfigTool\IISConfigTool.csproj">
       <Project>{29e83e2d-e3ad-4e20-849f-d20cc32df583}</Project>
       <Name>IISConfigTool</Name>