Revert "Adding Microsoft.AspNetCore.SignalR.Specification.Tests (#1202)"
Revert "Adding Microsoft.AspNetCore.SignalR.Specification.Tests (#1202)"

This reverts commit 707f6b3e286e5035c2e61805493249e49c2c7bc9.

aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore