Add route for default gateway from hook
Add route for default gateway from hook

Change-Id: I611d8da92e3f909fcdc0903ddc34845cceaa7532

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