This makes it easier to compose secret management with a variety
of lua functions without having to build that directly into each
of them.
In particular: one can now use vaults or other secret stores that
we add in the future to manage credentials for HTTP clients.
Break out the KeySource object into its own reference page to
avoid manually duplicating the same information into multiple pages.
Explain how to use data fetched from eg: sqlite.
Cloud User
Mike Hillyer
Wez Furlong