This only happens when sudo unloads the last python plugin.
The reason doing so is because there are some python modules which
does not support importing them again after destroying the interpreter
which has imported them previously.
Another solution would be to just leak the interpreters (let the kernel
free up), but then there might be some python resources like open files
would not get cleaned up correctly if the plugin is badly written.
Tests are meant to test the scenario sudo does, so I have modified them
to generally do not unlink but only a few times (~per plugin type) so it
does not use 48 interpreters (one gets started on every plugin->open) and
it is visible at least which type of plugin fails deinit if there is an
error.
The main problem was that string array objects were constructed
differently:
- if constructed by the test, then the elements were constant
- if constructed by the plugin, then the elements were allocated
Modified it so that now each array contains allocated strings so
they can be handled similarly. For freeing, I have used the
str_array_free function from the plugin, so I have linked its object
into the test runner.
Happy path is now free of "definitely lost" memleaks, so the test
can be used for valgrind.
