Allow user to specify IP of known Distribution Point - similar to pxethief option 2

[Mayyhem]

Updated pxethiefy to allow the user to specify the IP address of a PXE-enabled distribution point instead of locating a DHCP server first. Tested in a lab with a PXE-enabled distribution point. I have not tested explore via interface after these changes due to lack of support in my lab.

[csandker]

Hey @Mayyhem,
sorry for the late reply. I've got this on my list to run this in my Lab and then merge, might take me a few more days though.

Thanks for the contribution ;)

[xopham]

@Mayyhem thanks for the contribution 🙏 we are a bit short on capacity atm, so we are taking a bit here.
However, the changes seem small enough. If @csandker confirms I am happy to merge the PR.

Otherwise, @bka-dev might be able to take a look at a later point.

[csandker]

@Mayyhem we decided it's best to give pxethiefy a new home as I can't maintain the project here any longer. Could you open up a new PR here: https://github.com/csandker/pxethiefy

Also: There are some bits I've messed up, which I will fix after your PR, so thanks for pushing this ;)

[Mayyhem]

Sounds good I'll do that now, thanks!

[csandker]

All done and merged here: https://github.com/csandker/pxethiefy

This PR can be closed now @xopham