* Move some test helper stuff from the vault package to a new helper/testhelpers/corehelpers package. Consolidate on a single "noop audit" implementation.
* Add 'plugin list' command
* Add 'plugin register' command
* Add 'plugin deregister' command
* Use a shared plugin helper
* Add 'plugin read' command
* Rename to plugin info
* Add base plugin for help text
* Fix arg ordering
* Add docs
* Rearrange to alphabetize
* Fix arg ordering in example
* Don't use "sudo" in command description