This is based on @eighthave's templates, and the work we've been
doing to present a uniform testing environment.

Eventually this should be used by every one of our CI scripts.

This is a defense-in-depth fix; closes 6198.

Frequently we want to do

    if (s) {
      memwipe(s, 0, sizeof(s));
      tor_free(s);
    }

and it's good to have a way to do this concisely.

We found this in #40076, after we started using buf_move_all() in
more places.  Fixes bug #40076; bugfix on 0.3.3.1-alpha.  As far as
I know, the crash only affects master, but I think this warrants a
backport, "just in case".

The failing case is #if'd out for now, but will be fixed in the next
commit.

Testing for a fix for #40076.

Fix crash introduced in #40020. On startup, tor calls
check_private_dir on the data and key directories. This function
uses open instead of opendir on the received directory. Data and
key directoryes are only opened here, so the seccomp rule added
should be for open instead of opendir, despite the fact that they
are directories.

Fixes bug 31036; bugfix on 0.2.1.8-alpha when we moved the logging
system to use posix fds.

They are about to be shutdown in September.
Signed-off-by: David Goulet <dgoulet@torproject.org>