update the gateway for all my smartOS machines to the global zones gateway.

updateNics.sh

# find gateway based on global zone gateway

export GATEWAY=$(netstat -r | grep default | awk '{ print $2 }')

for uuid in `vmadm list -H -o uuid`; do echo "{
  \"update_nics\": [
    {
      `vmadm get $uuid | json nics | grep mac`
      \"gateway\":\"${GATEWAY}\"
    }
  ]
}" | `vmadm update $uuid`; done