Add a stdlib::ip_in_range() function

[iglov]

It's very useful function from https://github.com/deanwilson/puppet-ip_in_range . Why you haven't include it so far?

[hlindberg]

I think this needs to be refactored to use the modern (4.x) function API, and that the function should be namespaced to stdlib to avoid potentially clashing with similar function in other modules (namespacing cannot be done in the 3.x API).
There is also the need to clean up the commits.

Others need to chime in on the usefulness of the function and if it should be added to stdlib in the first place. I will make some review comments meanwhile.

[hlindberg]

This documentation may be of value: https://puppet.com/docs/puppet/6.3/functions_refactor_legacy.html

[iglov]

Hey, @hlindberg ! Thank u, for ur revision, i appreciate it! I've done some fixes. Could u plz check it and says what should i doing next?
P.S. How i should clear commits? Create new pull request with 1 commit? :)

[hlindberg]

Much better! I added a couple of suggestions with improvements to the documentation of the parameters.
Once you changed this, do squash all your commits into one and write the commit comment in imperative form (suggestion): Add a stdlib::ip_in_range() function to check if a given IP is in a given range

[iglov]

Hey, @hlindberg ! Thanks a lot, ur so helpful! Now, how i think, i totally done with this task :)

[eimlav]

Hi @iglov . Thanks for your contribution (and @hlindberg for reviewing). This change looks good to me. Cheers!