Merge pull request #2657 from pallavit/Issue#1840

Enable System.IO.Pipes test disabled against Issue#1840

Author: pallavit

src/System.IO.Pipes/tests/AnonymousPipesSimpleTest.cs

@@ -199,7 +199,6 @@ public static async Task ServerPInvokeChecks()
     }
 
     [Fact]
-    [ActiveIssue(1840, PlatformID.Windows)]
     public static async Task ClientPInvokeChecks()
     {
         using (AnonymousPipeServerStream server = new AnonymousPipeServerStream(PipeDirection.In, System.IO.HandleInheritability.None, 4096))

src/System.IO.Pipes/tests/NamedPipesSimpleTest.cs

@@ -355,7 +355,6 @@ public static async Task ClientPInvokeChecks()
     }
 
     [Fact]
-    [ActiveIssue(1840)]
     [PlatformSpecific(PlatformID.Windows)]
     public static void ClientServerMessages()
     {
@@ -407,7 +406,6 @@ public static void ClientServerMessages()
     }
 
     [Fact]
-    [ActiveIssue(1840, PlatformID.Windows)]
     public static async Task ServerCloneTests()
     {
         const string pipeName = "fooclone";
@@ -439,7 +437,6 @@ public static async Task ServerCloneTests()
     }
 
     [Fact]
-    [ActiveIssue(1840, PlatformID.Windows)]
     public static async Task ClientCloneTests()
     {
         const string pipeName = "fooClientclone";