fix dnsmasq package to remove, cert generation commands and configura…

[olivierlevon]

…tion file

[StuartCheshire]

Hey Olivier, thanks for your pull request. It appears that you made changes right around the same time that I had the README file open making similar edits, and now there are conflicts in your pull request. Can you update the pull request to resolve these? Will you be at the IETF 105 Hackathon in Montréal? If so, please come by our table and we can sit down together to work on this.

[olivierlevon]

Hi Stuart,

I just resolved the conflict on the README.md file. As the option "my-name discoveryproxy.home.arpa." is not working for now, I just think that it's better to comment it out at least.
I also made a PR for some fixes around calloc.
Sorry, but I won't be in Montréal. But I will keep an eye on the work produced if it's still shared on IETF Github or https://opensource.apple.com/tarballs/mDNSResponder/IETF/. :)