Fix license (it started to be more complicated than trivial config). Remove autogen/source file info from rOPS.

Improve README

The former parser was for PHP 5.5.8, we're now up-to-date with PHP 7.1.6 (Phabricator constraint, our image is PHP 7.4.10).

A last modification in user Dockerfile will be needed to use symlinks populated by main image in /root, but that will be for another review.

Output test with echo before 'docker run' commands

UID is readonly on current Debian sh implementation

Some shellcheck fixes

Fix GPG packages (no install recommends = we didn't have the complete suite)

Prune copy/paste error (was intended for test container, not for Dockerfile).

Consolidate sysctl changes using sysctl.present

Diff between versions

This also fixes the following issues:

Let's rewire tunnels against router-001.nasqueron.org / 51.255.124.8 / 172.27.27.1