CLOUDSTACK-4203: Adding a test for migrating volumes of stopped vms to test_stopped_vm.py

Signed-off-by: sanjeevneelarapu <sanjeev.neelarapu@citrix.com>
Signed-off-by: venkataswamybabu budumuru <venkataswamybabu.budumuru@citrix.com>

s
(cherry picked from commit dfee47e3b6c35d08cba7f28433b9e1bce12b4078)