Implements running plugins in containers to give them some degree
of isolation from the main Vault process and other plugins. It only
supports running on Linux initially, where it is easiest to manage unix
socket communication across the container boundary.
Additionally
* Adds -env arg to vault plugin register.
* Don't return env from 'vault plugin info'
Historically it's been omitted, and it could conceivably have secret information in
it, so if we want to return it in the response, it should probably only be via explicit
opt-in. Skipping for now though as it's not the main purpose of the commit.
This provides the github.com/hashicorp/vault/api package which contains code useful for interacting with a Vault server.
For examples of how to use this module, see the vault-examples repo.
For a step-by-step walkthrough on using these client libraries, see the developer quickstart.
07e76196ba
