What type of PR is this?

• bug

What this PR does / why we need it:

With current version of autocomplete script, shell quotes gets expanded incorrectly

Consider the following example:
my-cli --url http://localhost:8000 he (pressing tab should auto-complete to help, but it doesn't)
Why doesn't it auto-complete?
Because it calls the following command:
my-cli --url http : //localhost : 8000 --generate-bash-completion
And if we put it in quotes my-cli --url "http://localhost:8000" he
It calls:
my-cli --url '"http://localhost:8000"' --generate-bash-completion

Both fail, so CLI fails to call correct URL and return a list of completions.
With this PR it sends correct data
Actually I am not sure if that's the best solution, I checked how cobra does this and converted to our use case
It looks like the _init_completion function does all the magic and makes it work, I don't understand why unfortunately

P.S. I hope it'll be backported to 2.x series too (:

Testing

I tested multiple cases, i.e. sending one positional argument, 2 of them, or argument + flag, the CLI receives same arguments as before, but now more cases work

Release Notes

Fixed shell expansion in bash autocompletion scripts