[vtctl] hidden commands, plus misc tidying#9005

Merged

ajm188 merged 3 commits intovitessio:mainfrom

ajm188:vtctl-hidden-commands

Oct 18, 2021

Commits on Oct 15, 2021

Add `hidden` field to command struct to remove help-string magic
Andrew Mason
committed
Tidy up imports while I'm here
Andrew Mason
committed
Remove now-empty test file
Andrew Mason
committed