creating a new network in SciCloud

To create a new network:

1. networks>create network>subnet=192.168.0.0/24
2. create routers>select external network to attach the routers>create an interface to the new network
3. Now a new instance can be attached to the new network. However, it could not resolve the URL, a DNS servers in /etc/resolv.conf need to be change. Add "nameserver 8.8.8.8" to the /etc/resolv.conf