Check CLI Commands for consistency

[zramsay]

Edited to have complete list of gaiacli commands. Complete checkboxes to close the issue:

• init - R4R: Remove unimplemented gaiacli init command #3156
• status
• config - need to specify desired user interaction and modify
• query
  • tendermint-validator-set
  • block
  • txs
  • tx
  • account
  • gov - subcommands
  • stake - subcommands
  • slashing - subcommands
• tx
  • send
  • sign
  • broadcast
  • gov - subcommands
  • dist - subcommands
  • stake - subcommands
  • slashing - subcommands
• rest-server - ensure help text has link to documentation
• keys - update list order
  • add
  • list
  • show
  • update
  • delete
  • mnemonic
• version

[jackzampolin]

We should also add working examples (cobra.Command.Example) to each of the commands that shows proper usage.