Updating test TFMs for custom test discovery

test/Microsoft.AspNetCore.Cryptography.Internal.Test/project.json

@@ -16,7 +16,7 @@
       },
       "imports": "portable-net451+win8"
     },
-    "dnx451": {
+    "net451": {
       "dependencies": {
         "xunit.runner.console": "2.1.0"
       },

test/Microsoft.AspNetCore.Cryptography.KeyDerivation.Test/project.json

@@ -14,7 +14,7 @@
       },
       "imports": "portable-net451+win8"
     },
-    "dnx451": {
+    "net451": {
       "dependencies": {
         "xunit.runner.console": "2.1.0"
       },

test/Microsoft.AspNetCore.DataProtection.Abstractions.Test/project.json

@@ -14,7 +14,7 @@
       },
       "imports": "portable-net451+win8"
     },
-    "dnx451": {
+    "net451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
         "xunit.runner.console": "2.1.0"

test/Microsoft.AspNetCore.DataProtection.Extensions.Test/project.json

@@ -18,7 +18,7 @@
       },
       "imports": "portable-net451+win8"
     },
-    "dnx451": {
+    "net451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
         "xunit.runner.console": "2.1.0"

test/Microsoft.AspNetCore.DataProtection.Test.Shared/project.json

@@ -7,7 +7,7 @@
       },
       "imports": "portable-net451+win8"
     },
-    "dnx451": {}
+    "net451": {}
   },
   "shared": "**/*.cs"
 }

test/Microsoft.AspNetCore.DataProtection.Test/AnonymousImpersonation.cs

@@ -1,7 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-#if DNX451
+#if NET451
 using System;
 using System.Runtime.ConstrainedExecution;
 using System.Runtime.InteropServices;

test/Microsoft.AspNetCore.DataProtection.Test/project.json

@@ -18,7 +18,7 @@
       },
       "imports": "portable-net451+win8"
     },
-    "dnx451": {
+    "net451": {
       "dependencies": {
         "Moq": "4.2.1312.1622",
         "xunit.runner.console": "2.1.0"