[bug#54457] [PATCHv3 0/9] Add netfilter tools and libraries

[fesoj000]

- fixed names s/_/-/
- fixed libnetfilter-cttimeout inputs
- use #$output where possible
- keep urls as a single string literal
- move supported-systems to the 'bottom'
- have every ulogd plugin in a separate output. To use a plugin, one
  has to include the absolute path to the <plugin>.so in the ulogd
  config file. That means, from a package point of view, no extra
  measures are necessary to make the plugins available to ulogd.
  A ulogd-service-type will need to take care of the plugin paths.