Create the demo user's networks

Create a network and subnet for the demo user after
the rug is started.

Change-Id: I795e200524c7948cea41cd4f08a311dd7d8b7dc7
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>
Merge pull request #3 from dhellmann/create-demo-networks

Create the demo user's networks