The varnish package (from packagecloud.io) makes the VSM directories
non-world-readable, but readable to the group varnish.

So the RPM no longer creates the group trackrdrd, but adds the
trackrdrd to group varnish.

No git tag yet, testing automated packaging with version number.

Into separate files.

This requires a user who can write in /var/log. So we now create
user/group trackrdrd at pre-install, and the default config runs
with that user for the child process.

Because ActiveMQ uses std::auto_ptr, deprecated since C++11.

This leaks memory; apparently it has been an unsafe practice all
along. But support for ActiveMQ will be discontinued anyway.

and update documentation.

The "legacy" syntax is still tolerated, so a number after "track" is
skipped over. Also add a regression test in which the new syntax is
used, the old regression test is retained as a legacy test.