switch kestrel back to libuv til bugs are fixed

util/Server/Program.cs

@@ -14,7 +14,9 @@ namespace Bit.Server
             var builder = new WebHostBuilder()
                 .UseConfiguration(config)
                 .UseKestrel()
-                .UseStartup<Startup>();
+                .UseStartup<Startup>()
+                // ref: https://github.com/aspnet/KestrelHttpServer/issues/2694
+                .UseLibuv();
 
             var contentRoot = config.GetValue<string>("contentRoot");
             if(string.IsNullOrWhiteSpace(contentRoot))

util/Server/Server.csproj

@@ -8,6 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.App" Version="2.1.2" />
+    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv" Version="2.1.2" />
   </ItemGroup>
 
 </Project>