Lintian cleanups and package modernization

- Remove pre/post scripts, use dh-systemd to handle installing service
- Instead of trying to dpkg-divert /etc/dnsmasq.conf, install our config
to /etc/dnsmasq.d

Change-Id: I0053c49a7d666f397d55d0b6fbd43c0f2afef279
9 files changed
tree: 1b2308be921b5bb84ac5d5935fbe3c274cd7775c
  1. debian/
  2. etc/
  3. usr/