Have --sleep-interval honor the --skip-download flag

[petersjt014]

Checklist

• I'm reporting a feature request
• I've verified that I'm running youtube-dl version 2020.07.28
• I've searched the bugtracker for similar feature requests including closed ones

Description

Something like:

youtube-dl --sleep-interval 10 --write-info-json --skip-download https://www.youtube.com/user/TheLinuxFoundation

Will eventually 429, because no sleeping happens.

For that reason, I propose that --sleep-interval be honored for any network activity that downloads files, to improve the rate-limiting/429 prevention purpose it currently serves.

[dstftw]

This is already requested stop posting duplicates.

[petersjt014]

It's not. You closed the last one as invalid, stating that it's expected behavior and not a bug. I'm suggesting that the expected behavior be changed to better reflect the reason the flag is actually used. I've noted that in the description.

If it's not a bug or a feature, please tell me how to properly file it.

[petersjt014]

Also of note: I'd be happy to implement this myself.

I'd just need to know what/when to file issue-wise.