Add new OSTree remote update test
The test now will use a OSTree repo which has the parent OSTree commit used for the image that it's being tested.
It also uses rpm-ostree upgrade
instead of ostree admin switch
(an OStree rebase), and checks for functional features:
- Difference on packages installed.
- Difference on the distro version.
Here is an example of the test results: https://artifacts.dev.testing-farm.io/30c789a7-f1d6-4c4a-85bc-a1110c15d102/
Edited by Juanje Ojeda