[EC2] Creating VPCs with IGWs by default

Each new VPC created via rOCCI-server will by default have an
Internet Gateway. This allows the use of Elastic IP addresses
inside VPCs.
Merge pull request #47 from arax/ec2_netfix_pt2

[EC2] Creating VPCs with IGWs by default
[EC2] Added dummy networks to lists

Networks 'public' and 'private' are now included in responses
to listing and describing requests.
Merge pull request #48 from arax/ec2_netfix_pt2

[EC2] Added dummy networks to lists