switch kestrel back to libuv til bugs are fixed

src/Identity/Identity.csproj

@@ -15,6 +15,7 @@
   
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.2" />
+    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv" Version="2.1.2" />
   </ItemGroup>
 
 </Project>

src/Identity/Program.cs

@@ -10,6 +10,8 @@ namespace Bit.Identity
             WebHost
                 .CreateDefaultBuilder(args)
                 .UseStartup<Startup>()
+                // ref: https://github.com/aspnet/KestrelHttpServer/issues/2694
+                .UseLibuv()
                 .Build()
                 .Run();
         }