Issue with Microsoft.AspNetCore.Server.Testing IISDeployer on net451

[DavidObando]

In ApplicationDeployerFactory.cs we're ifdeffing on DNX451 but not on NET451. Is this by design? Is there a reason we can't include NET451 too?

It's currently making a couple of tests in the Performance repository to fail with message:

    Startup [Variation: StarterMvc_IISScenario] [Stage: Collection] [Iteration: 1/1] [FAIL]
      System.NotSupportedException : Found no deployers suitable for server type 'IIS' with the current runtime.
      Stack Trace:
           at Microsoft.AspNetCore.Server.Testing.ApplicationDeployerFactory.Create(DeploymentParameters deploymentParameters, ILogger logger)
        D:\GitHub\aspnet\Performance\src\Benchmarks.Utility\Helpers\IISTestManager.cs(51,0): at Benchmarks.Utility.Helpers.IISTestManager.Initialize(ILoggerFactory loggerFactory)
        D:\GitHub\aspnet\Performance\test\Microsoft.AspNetCore.Tests.Performance\WebIISPerformance.cs(30,0): at Microsoft.AspNetCore.Tests.Performance.WebIISPerformance..ctor(IISTestManager testManager)

If this is a DNX451 scenario only I'll disable these tests on non-DNX451 runtimes.

[Tratcher]

FYI we're not using the IIS Deployer in any of our automated tests because it requires running as admin. As such it hasn't been actively maintained and may have regressed due to recent framework churn.

[davidfowl]

So yes it's a bug and should be net451 instead of dnx451. The ifdef wasn't updated

[JunTaoLuo]

I think we can also remove DNX451 from https://github.com/aspnet/Hosting/find/dev#L60 as well

[BrennanConroy]

b5816f2