CLOUDSTACK: Add ex_list_nics, ex_attach_nic_to_vm, ex_detach_nic_from_vm + tests

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>

This closes #369
Cloudstack: Implemented VPC network acls and tests

Signed-off-by: Sebastien Goasguen <runseb@gmail.com>

This closes #371