[major] upgrade to bosh2 cli, links, cloud-config

[drnic]

• [ ] fail fast if bosh2 missing
• [ ] boshlite cloud-config.yml with default name for each concept; plus a public network
• [x] config/private.yml schema changed https://github.com/cloudfoundry/bosh-cli/issues/179
• [ ] use bosh2 add-blob to copy in blobs

See branch https://github.com/cloudfoundry-community/bosh-gen/tree/bosh2

[drnic]

Converted to a github project https://github.com/cloudfoundry-community/bosh-gen/projects/1

[drnic]

Started branch https://github.com/cloudfoundry-community/bosh-gen/tree/bosh2