Put PortReserver users into an xUnit collection

Author: dougbu

test/Microsoft.TestCommon/PortReserver.cs

@@ -12,6 +12,11 @@
 
 namespace Microsoft.TestCommon
 {
+    [Xunit.CollectionDefinition("PortReserver Collection", DisableParallelization = true)]
+    public class PortReserverCollection
+    {
+    }
+
     /// <summary>
     /// This class allocates ports while ensuring that:
     /// 1. Ports that are permanently taken (or taken for the duration of the test) are not being attempted to be used.

test/System.Web.Http.Owin.Test/OwinHostIntegrationTest.cs

@@ -12,6 +12,7 @@
 
 namespace System.Web.Http.Owin
 {
+    [Xunit.Collection("PortReserver Collection")] // Avoid conflicts between different PortReserver consumers.
     public class OwinHostIntegrationTest
     {
         [Fact]

test/System.Web.Http.SelfHost.Test/Authentication/BasicOverHttpTest.cs

@@ -10,6 +10,7 @@
 
 namespace System.Web.Http
 {
+    [Xunit.Collection("PortReserver Collection")] // Avoid conflicts between different PortReserver consumers.
     public class BasicOverHttpTest
     {
         [Fact]

test/System.Web.Http.SelfHost.Test/HttpSelfHostResponseTest.cs

@@ -12,6 +12,7 @@
 
 namespace System.Web.Http.SelfHost
 {
+    [Xunit.Collection("PortReserver Collection")] // Avoid conflicts between different PortReserver consumers.
     public class HttpSelfHostResponseTest
     {
         [Fact]

test/System.Web.Http.SelfHost.Test/HttpSelfHostServerTest.cs

@@ -18,6 +18,7 @@
 
 namespace System.Web.Http.SelfHost
 {
+    [Xunit.Collection("PortReserver Collection")] // Avoid conflicts between different PortReserver consumers.
     public class HttpSelfHostServerTest : IDisposable
     {
         private HttpSelfHostServer server = null;