Destroy shouldn't fail when already destroyed
Destroy shouldn't fail when already destroyed

Change-Id: Id8baa71b4e1254c8845a9d912d52acc65b01c796

tangfeixiong/garden,savaki/garden,shashidharatd/garden-linux,tsaleh/garden,cloudfoundry-incubator/garden,cloudfoundry-incubator/garden-linux,cloudfoundry-incubator/garden,cloudfoundry-incubator/garden-linux,shashidharatd/garden-linux,tsaleh/garden,shashidharatd/garden-linux,shashidharatd/garden-linux,savaki/garden,cloudfoundry-incubator/garden-linux,tangfeixiong/garden