Add command level formatter, that incapsulates command output printing
logiс that depends on the command `-format` option.
Move Print* functions from acl_helpers to prettyFormatter. Add jsonFormatter.
Also update the Docs and fixup the HTTP API to return proper errors when someone attempts to use Namespaces with an OSS agent.
Add Namespace HTTP API docs
Make all API endpoints disallow unknown fields
R.B. Boyer
Artur Mullakhmetov
Matt Keeler