Feature vdc vnet integration

Reopened the branch since an error has been found in the integration test.

http://ci.wakame.jp/job/kvm.t12-integration-rw/1315/console

    22:48:18 [2014-03-16T22時48分18秒 #27294] time:1 eval:document_pair? load_balancer lb-oo8e7aso state terminated
    22:48:21 [2014-03-16T22時48分21秒 #27294] time:2 eval:document_pair? load_balancer lb-oo8e7aso state terminated
    22:48:24 [2014-03-16T22時48分24秒 #27294] time:3 eval:document_pair? load_balancer lb-oo8e7aso state terminated
    ...
    22:49:59 Ran 1 test.
    22:49:59 
    22:49:59 FAILED (failures=1)
    22:49:59 make: *** [test] エラー 1
    22:49:59 Build step 'Execute managed script' marked build as failure
    22:50:00 Notifying upstream projects of job completion
    22:50:00 Finished: FAILURE

This is due to missing some operation in the kvm driver.

http://ci.wakame.jp/job/kvm.pick-log/1172/console