Setting connection timeout per host?

[Daniel Stenberg via curl-library]

Should the old option perhaps still remain as a "total time to try" option?
individual-IP-timeout: 5 seconds (the new option)
total-connect-timeout: 20 seconds (the old option)

Hello again!

I made a first attempt at implementing this idea and created a pull request
out of it:

https://github.com/curl/curl/pull/6814

I'm very interested in feedback - from everyone!