Adding ADF V2 SDK (Azure#3727)

* Adding ADF V2 SDK

  * This SDK is for the new Azure Data Factory V2 platform/service,
    which lives side-by-side with the existing "V1" GA service.

* Added ADF V2 description and release notes and fixed the assembly version

src/SDKs/DataFactory/DataFactory.Tests/DataFactory.Tests.csproj

@@ -0,0 +1,33 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="$([MSBuild]::GetPathOfFileAbove('AzSdk.test.reference.props'))" />
+  <PropertyGroup>
+    <PackageId>DataFactory.Tests</PackageId>
+    <Description>DataFactory.Tests Class Library</Description>
+    <AssemblyName>DataFactory.Tests</AssemblyName>
+    <VersionPrefix>1.0.0-preview</VersionPrefix>
+  </PropertyGroup>
+  <PropertyGroup>
+    <TargetFrameworks>netcoreapp1.1</TargetFrameworks>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Management.DataFactory\Microsoft.Azure.Management.DataFactory.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="SessionRecords\**\*.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+    <None Update="TestData\**\*.json">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Update="Microsoft.NET.Test.Sdk" Version="15.3.0" />
+    <PackageReference Update="Microsoft.Rest.ClientRuntime.Azure.TestFramework" Version="1.7.2" />
+  </ItemGroup>
+</Project>

src/SDKs/DataFactory/DataFactory.Tests/JsonSamples/ActivityJsonSamples.cs

@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License. See License.txt in the project root for
+// license information.
+
+using DataFactory.Tests.Utils;
+
+namespace DataFactory.Tests.JsonSamples
+{
+    public class ActivityJsonSamples : JsonSampleCollection<ActivityJsonSamples>
+    {
+        [JsonSample]
+        public const string ExecutePipelineActivity = @"
+      {
+        ""name"": ""myExecutePipelineActivity"",
+        ""type"": ""ExecutePipeline"",
+        ""typeProperties"": {
+          ""pipeline"": {
+             ""referenceName"": ""myTriggeredPipeline"",
+             ""type"":""PipelineReference""
+          },
+          ""parameters"": {
+          }
+        }
+      }
+";
+    }
+}