Change AutobahnTester to use dynamic ports with Kestrel (#238)

- Depends on aspnet/Hosting#1388
- Addresses dotnet/aspnetcore#3062

Author: mikeharder

build/dependencies.props

@@ -9,7 +9,7 @@
     <MicrosoftAspNetCoreHttpExtensionsPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreHttpExtensionsPackageVersion>
     <MicrosoftAspNetCoreServerHttpSysPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreServerHttpSysPackageVersion>
     <MicrosoftAspNetCoreServerIISIntegrationPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreServerIISIntegrationPackageVersion>
-    <MicrosoftAspNetCoreServerIntegrationTestingPackageVersion>0.5.0-preview2-32233</MicrosoftAspNetCoreServerIntegrationTestingPackageVersion>
+    <MicrosoftAspNetCoreServerIntegrationTestingPackageVersion>0.5.0-a-preview3-deployment-parameters-scheme-16978</MicrosoftAspNetCoreServerIntegrationTestingPackageVersion>
     <MicrosoftAspNetCoreServerKestrelHttpsPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreServerKestrelHttpsPackageVersion>
     <MicrosoftAspNetCoreServerKestrelPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreServerKestrelPackageVersion>
     <MicrosoftAspNetCoreStaticFilesPackageVersion>2.1.0-preview3-32233</MicrosoftAspNetCoreStaticFilesPackageVersion>

test/Microsoft.AspNetCore.WebSockets.ConformanceTest/Autobahn/AutobahnTester.cs

@@ -129,7 +129,6 @@ public void Verify(AutobahnResult result)
 
         public async Task DeployTestAndAddToSpec(ServerType server, bool ssl, string environment, CancellationToken cancellationToken, Action<AutobahnExpectations> expectationConfig = null)
         {
-            var baseUrl = ssl ? "https://localhost:0" : "http://localhost:0";
             var sslNamePart = ssl ? "SSL" : "NoSSL";
             var name = $"{server}|{sslNamePart}|{environment}";
             var logger = _loggerFactory.CreateLogger($"AutobahnTestApp:{server}:{sslNamePart}:{environment}");
@@ -146,7 +145,7 @@ public async Task DeployTestAndAddToSpec(ServerType server, bool ssl, string env
 #endif
             var parameters = new DeploymentParameters(appPath, server, RuntimeFlavor.CoreClr, RuntimeArchitecture.x64)
             {
-                ApplicationBaseUriHint = baseUrl,
+                Scheme = (ssl ? Uri.UriSchemeHttps : Uri.UriSchemeHttp),
                 ApplicationType = ApplicationType.Portable,
                 TargetFramework = targetFramework,
                 EnvironmentName = environment,