Fix error status for get_from_manager method

Parameter 'error_statuses' is processed as a list type, but in heat
utils it's a string value. As result Failed stack will never be deleted.
In this patch error_statuses is changed to expected list type.

Change-Id: I3fa1def29e0afa7a808a58cd1e806360f35f5f9d
Merge "Fix error status for get_from_manager method"