Make sure we test the version of osbuild in the current checkout,
rather than the system instance.
Also default to using in-place directories for the object store
and output images. Using a tmpfs does not scale, especially on
CI infrastructue with limited memory.
The behavior can still be overridden by the environment variable,
as before, only the default changes.
Signed-off-by: Tom Gundersen <teg@jklm.no>
The testing script is getting too big and not very well organized. In
this commit a new module `integration_tests` is introduced that contains
parts of the original testing script split into multiple files. The
content should be the same, the only difference is that now you can run
the tests by invoking `python3 -m test`.
