neutron command: automatically add log to NeutronCommand

It is a common pattern to add
class XXXCommand(NeutronCommand):
    log = logging.getLogger(__name__ + '.<command name>').
So introduce a metaclass to do that automatically in order to simplify
the code a bit.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
adv-svc-vm: support service vm framework(WIP)

implement commands related to service vm framework.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>