Chronograf 1.11 - tab completion for command line tools would be nice

[karel-rehor]

While testing PR #6211 I needed to work with the ./chronoctl CLI utility. I noted that tab completion in bash for long commands like $ ./chronoctl gen-secrets-master-key was not available.

With long commands and options tab completion would be NICE to have.

[Huaian666]

this is actually really well done. grabbed a few ideas from the code