Fixes #34710 - Use foreman request address

[sbernhard]

1. Next-server in windows iPXE default template does only work in dhcp environments but not with static IPs
2. A method which only returns the request address (fqdn + port) of foreman or the related smart proxy is often useful

[theforeman-bot]

Issues: #34710

[ofedoren]

Thanks, @sbernhard, seems OK to me, just few nitpicks. Also,

Next-server in windows iPXE default template does only work in dhcp environments but not with static IPs

Does this change effect working in DHCP environments?

[sbernhard]

Thank you very much for your review and your comments. I added them.

Does this change effect working in DHCP environments?

It should but let me ask my colleagues again.

[SimonLorentz]

Does this change effect working in DHCP environments?

Hello, the change will only effect working in DHCP, if you want to use another server than foreman or proxy as next server and want strictly to set this via DHCP and not an extra variable.

So normally it has no negativ effect for DHCP scenarios

[ofedoren]

Thanks, @sbernhard and @SimonLorentz. 🟢 from me, but I'd leave it a bit for another pair of eyes in case I missed something :/

[ezr-ondrej]

Apart of confusing name, and possible imporovements on the docs, LGTM 👍
I'll leave up to @ofedoren to judge if those improvements are worth while :)

[ofedoren]

Thanks, @sbernhard, @ezr-ondrej, merging :)