Add warning when deployment debug setting is enabled

Author: vivsriaus

src/ResourceManager/Resources/Commands.Resources/ResourceGroupDeployments/NewAzureResourceGroupDeploymentCommand.cs

@@ -63,6 +63,11 @@ public override void ExecuteCmdlet()
                 DeploymentDebugLogLevel = GetDeploymentDebugLogLevel(DeploymentDebugLogLevel)
             };
 
+            if(!string.IsNullOrEmpty(DeploymentDebugLogLevel))
+            {
+                WriteWarning("The DeploymentDebug setting has been enabled. This can potentially log secrets like passwords used in resource property or listKeys operations when you retrieve the deployment operations through Get-AzureRmResourceGroupDeploymentOperation");
+            }
+
             if(this.Mode == DeploymentMode.Complete)
             {
                 this.ConfirmAction(