tests/functional: switch over to using self.data_file(...)

This removes direct path manipulation to figure out the source dir

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20241217155953.3950506-14-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed