Create a new top-level directory called test-data, which will carry
all the test data which is large and/or shared between multiple tests.
There are actually several new subdirectories created:
test-data/binaries: The pre-built binary and library files for random
architectures that we use to test various architecture detection
features (was part of tests/data).
test-data/blank-disks: The blank disks which are used for disk format
detection (was part of tests/data).
test-data/files: Other miscellaneous test files from tests/data that
are not included in the above.
test-data/phony-guests: The phony guests (was tests/guests).
test-data: The top-level directory builds the 'test.iso' image file
that is used for testing the C API and in miscellaneous other tests.
This allows the Python binding of guestfs_add_libvirt_dom to work.
There is a regression test to ensure this keeps working.
Note this requires a patched libvirt-python, supporting the
c_pointer() method.
If the user set PYTHON when configuring, this variable is not passed
through to the tests, so it is possible the tests will fail because
they are testing the wrong version of python. By passing $PYTHON
through to the tests we ensure that we test against the same version
of python that we configured with.
