Merged common code base for SqlUtil.cs (#2533)

Author: arellegue

src/Microsoft.Data.SqlClient/netcore/src/Microsoft.Data.SqlClient.csproj

@@ -664,7 +664,6 @@
     <Compile Include="Microsoft\Data\SqlClient\SqlDiagnosticListener.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlInternalConnectionTds.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlTransaction.cs" />
-    <Compile Include="Microsoft\Data\SqlClient\SqlUtil.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParser.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParser.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParser.RegisterEncoding.cs" />