Added ValidateSet for SampleName

Author: jaredmoo

src/ResourceManager/Sql/Commands.Sql/Database/Cmdlet/NewAzureSqlDatabase.cs

@@ -102,7 +102,7 @@ public class NewAzureSqlDatabase : AzureSqlDatabaseCmdletBase<AzureSqlDatabaseCr
 
         [Parameter(Mandatory = false,
             HelpMessage = "The name of the sample schema to apply when creating this database.")]
-        [ValidateNotNullOrEmpty]
+        [ValidateSet(Management.Sql.Models.SampleName.AdventureWorksLT)]
         public string SampleName { get; set; }
 
         /// <summary>