Fix running Unit Tests locally for VS17.3 (#109)

***NO_CI***

Author: networkfusion

Tests/nano.runsettings renamed to .runsettings

@@ -5,7 +5,8 @@
        <MaxCpuCount>1</MaxCpuCount>
        <ResultsDirectory>.\TestResults</ResultsDirectory><!-- Path relative to solution directory -->
        <TestSessionTimeout>120000</TestSessionTimeout><!-- Milliseconds -->
-       <TargetFrameworkVersion>Framework40</TargetFrameworkVersion>
+       <TargetFrameworkVersion>net48</TargetFrameworkVersion>
+       <TargetPlatform>x64</TargetPlatform>
    </RunConfiguration>
    <nanoFrameworkAdapter>
        <Logging>None</Logging>

Tests/Aws.IoTCore.Devices.UnitTests.nfproj

@@ -25,16 +25,12 @@
     <RestoreLockedMode Condition="'$(TF_BUILD)' == 'True' or '$(ContinuousIntegrationBuild)' == 'True'">true</RestoreLockedMode>
   </PropertyGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.props" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.props')" />
-  <PropertyGroup>
-    <RunSettingsFilePath>$(MSBuildProjectDirectory)\nano.runsettings</RunSettingsFilePath>
-  </PropertyGroup>
   <ItemGroup>
     <Compile Include="ShadowTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ShadowJsonMessageExamples.cs" />
   </ItemGroup>
   <ItemGroup>
-    <None Include="nano.runsettings" />
     <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
@@ -69,9 +65,6 @@
       <Private>True</Private>
     </Reference>
   </ItemGroup>
-  <ItemGroup>
-    <None Include="packages.config" />
-  </ItemGroup>
   <Import Project="$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets" Condition="Exists('$(NanoFrameworkProjectSystemPath)NFProjectSystem.CSharp.targets')" />
   <!-- MANUAL UPDATE HERE -->
   <ProjectExtensions>