Include the exception from urllib in wget test

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
CLOUDSTACK-3989: We don't hold the vm object

VirtualMachine.list( only gives the list of vms but not the vm object as
returned by VirtualMachine.create( any operations on the listed VMs then
fails. Explicit call to startVirtualMachine as in setUpClass fixes this.

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
(cherry picked from commit f064ad22dc55e0e5e7b5165f1864f2339d39b8f4)