The content of `/usr/lib/tmpfiles.d/rpm-ostree-1-autovar.conf` is
dynamically created and its lines are not ordered deterministically.
This causes the rpm-ostree based image test cases to fail often on
Fedora, because the diff of the expected and actual image-info report
always produces some different lines.
Add a new option `-skip-tmpfilesd-path` to `osbuild-image-tests`
accepting a tmpfiles.d configuration path, which should be ignored when
comparing the expected and actual image-info report. The option can be
specified multiple times and all paths will be ignored.
Modify the `image_tests.sh` test case to use the new option and ignore the
`/usr/lib/tmpfiles.d/rpm-ostree-1-autovar.conf` file when testing Fedora
images.
Signed-off-by: Tomas Hozza <thozza@redhat.com>