replaced dev container Dockerfile with one which uses
Ubuntu instead of Alpine. The Docker in Docker feature only
works on Ubuntu, not Debian or Alpine, and the LLDB extension
to enable debugging only supports Debian/Ubuntu
this just involved a better understanding of the data
types provided by libnl and some refactoring to make querying
as a user of the libnl library easier
One of the more interesting selling points about this project is that it
works through local system firewalls on Linux (iptables, nf_tables)
This commit makes the testing environments in the docker containers
actually have to go up against a firewall, one which has a default
incoming and outgoing policy of drop
