Move a fet left over items to new format

build/ToolsetPackages/InternalToolset.csproj

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
-<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\Targets\SettingsSdk.props" />
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net46</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.DotNet.IBCMerge" Version="$(MicrosoftDotNetIBCMerge)" />
   </ItemGroup>
-  <Import Project="..\Targets\Imports.targets" />
 </Project>

build/ToolsetPackages/RoslynToolset.csproj

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
-<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\Targets\SettingsSdk.props" />
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>$(RoslynPortableTargetFrameworks)</TargetFrameworks>
   </PropertyGroup>
@@ -36,5 +35,4 @@
   <ItemGroup Condition="'$(TargetFramework)' == 'netcoreapp2.0'">
     <PackageReference Include="dotnet-xunit" Version="$(dotnetxunitVersion)" />
   </ItemGroup>
-  <Import Project="..\Targets\Imports.targets" />
 </Project>

src/Tools/BuildUtil/BuildUtil/BuildUtil.csproj

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
-<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\..\..\..\build\Targets\SettingsSdk.props" />
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <Configuration Condition="'$(Configuration)' == ''">Debug</Configuration>
     <Platform Condition="'$(Platform)' == ''">AnyCPU</Platform>
     <PlatformTarget>AnyCPU</PlatformTarget>
     <OutputType>Library</OutputType>
@@ -40,5 +38,4 @@
     <PackageReference Include="System.Text.RegularExpressions" Version="$(SystemTextRegularExpressionsVersion)" />
     <PackageReference Include="System.Threading.Thread" Version="$(SystemThreadingThreadVersion)" />
   </ItemGroup>
-  <Import Project="..\..\..\..\build\Targets\Imports.targets" />
 </Project>