Improve logging of kubernetes tests

The tests in the CI spit out a lot of logs for each test. These logs are very useful, but it can be difficult to distinguish between logs belonging to the test and logs belonging to the container setup/teardown. Additionally, not all of the log messages are very descriptive. For example, sometimes a random number is printed with no additional information.

I would propose to improve the clarity of this:

• Review the existing log messages to see whether they are descriptive enough
• Clearly indicate where the actual test(s) start and where the pod setup/teardown starts/stops