Use Bundled NETStandard.Library \ NETCoreApp versions instead of explicitly specifying one

Author: pranavkm

build/common.props

@@ -17,7 +17,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)'=='.NETFramework' AND '$(OutputType)'=='library'">
-    <PackageReference Include="NETStandard.Library" Version="$(NetStandardImplicitPackageVersion)" />
+    <PackageReference Include="NETStandard.Library" Version="$(BundledNETStandardPackageVersion)" />
   </ItemGroup>
 
 </Project>

build/dependencies.props

@@ -4,9 +4,7 @@
     <AspNetIntegrationTestingVersion>0.4.0-*</AspNetIntegrationTestingVersion>
     <CoreFxVersion>4.3.0</CoreFxVersion>
     <InternalAspNetCoreSdkVersion>2.0.0-*</InternalAspNetCoreSdkVersion>
-    <NetStandardImplicitPackageVersion>1.6.1</NetStandardImplicitPackageVersion>
-    <RuntimeFrameworkVersion>2.0.0-*</RuntimeFrameworkVersion>
     <TestSdkVersion>15.0.0</TestSdkVersion>
     <XunitVersion>2.2.0</XunitVersion>
   </PropertyGroup>
-</Project>
+</Project>