Standardize on method of supplying information to code samples

[ycombinator]

With the merge of #457 and #458, the code samples for Load Balancers, Identity, Compute, and Queues are using {...} style placeholders in places where the user must supply information prior to running the code samples. The Database, Networking, ObjectStore, Orchestration, and Volume code samples, however, continue to use the older getenv(...) style.

Consequently we are currently in an inconsistent state. This issue is to bring us out of this inconsistent state.

• Database
• Networking
• ObjectStore
• Orchestration
• Volume

[jamiehannaford]

(Edited OP with checklist)

[ycombinator]

Yay! Thanks @notFloran and @jamiehannaford!