Consider using "default" network in your cloud-config

[evanfarrar]

Several BOSH release authors have been using this convention for the network name ("default") in their sample manifests.

Future BOSH features may give special treatment to this network such that if the network is omitted from a manifest, then it will be assumed to be the network named "default".

We'd like to make it possible to support installing concourse-deployment or cf-deployment on a mostly vanilla BOSH director installed with BBL in only two commands with as few arguments as reasonably possible. There are many things we can change about BBL to accommodate this manifest, but this is one case where I'd prefer that the manifest change its defaults.