add keyvault package

Author: ejarvi

src/ResourceManager/Compute/Commands.Compute.Test/packages.config

@@ -7,6 +7,7 @@
   <package id="Microsoft.Azure.Graph.RBAC" version="3.4.0-preview" targetFramework="net452" />
   <package id="Microsoft.Azure.Management.Authorization" version="2.0.0" targetFramework="net45" />
   <package id="Microsoft.Azure.Management.Compute" version="18.0.0" targetFramework="net452" />
+  <package id="Microsoft.Azure.Management.KeyVault" version="2.3.0-preview" targetFramework="net452" />
   <package id="Microsoft.Azure.Management.Network" version="17.0.0-preview" targetFramework="net452" />
   <package id="Microsoft.Azure.Management.Storage" version="4.1.0-preview" targetFramework="net45" />
   <package id="Microsoft.Azure.Test.Framework" version="1.0.6179.26854-prerelease" targetFramework="net45" />