plan now produces output plan, apply now consumes outputted plan

examples/azure-vm-simple-linux/deploy.sh

@@ -12,12 +12,9 @@ terraform plan \
   -var 'admin_password='$KEY \
   -var 'admin_username='$KEY \
   -var 'resource_group='$KEY
+  -out ./out.tfplan
 
-terraform apply
-  -var 'dns_name='$KEY \
-  -var 'admin_password='$KEY \
-  -var 'admin_username='$KEY \
-  -var 'resource_group='$KEY
+terraform apply ./out.tfplan
 
 
 # TODO: determine external validation, possibly Azure CLI