Commits on Sep 1, 2022

1. kola: Add isolation=readonly|dynamicuser …

   Part of my war against duplicative comments in our kola tests.
   We have a few tests that write a comment like this:
   
   ```
    # - exclusive: false
    #   - This test doesn't make meaningful changes to the system and
    #     should be able to be combined with other tests.
   ```
   Of course, this comment is already redundant because the
   meaning of the `exclusive` tag is defined canonically in coreos-assembler
   (here) and copy-pasting that into every test that uses it would
   be pointlessly verbose.
   
   But - we can do one better.  Instead of having a test flag which
   is mainly an "I promise not to mutate the system in a way which could
   interfere with other tests", let's add a field that *enforces* this.
   Then it doesn't need to be commented; we have a variety of
   tests which are just "system inspection" (e.g. query rpmdb) and
   run just fine with `DynamicUser=yes` and hence *cannot* affect
   the system, and hence are inherently isolated from other concurrent
   tests.

   

   cgwalters committed Sep 1, 2022
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