Adding gallery

Author: ms-alguerra

src/ResourceManager/TrafficManager/Commands.TrafficManager2.Test/packages.config

@@ -5,6 +5,7 @@
   <package id="Microsoft.Azure.Common.Authentication" version="1.0.17-preview" targetFramework="net45" />
   <package id="Microsoft.Azure.Common.Dependencies" version="1.0.0" targetFramework="net45" />
   <package id="Microsoft.Azure.Management.Authorization" version="0.17.0-preview" targetFramework="net45" />
+  <package id="Microsoft.Azure.Gallery" version="2.6.2-preview" targetFramework="net45" />
   <package id="Microsoft.Azure.Management.Resources" version="2.14.1-preview" targetFramework="net45" />
   <package id="Microsoft.Azure.Test.Framework" version="1.0.5513.27084-prerelease" targetFramework="net45" />
   <package id="Microsoft.Azure.Test.HttpRecorder" version="1.0.5513.27084-prerelease" targetFramework="net45" />