test: Fix check-kubernetes import ordering issue

[lyandrew]

import parent has to come before import kubelib. There were other files with import parent not being first but those run without any issues.

  File "./test/verify/check-kubernetes", line 23, in <module>
    import kubelib
  File "/home/dell/cockpit/test/verify/kubelib.py", line 26, in <module>
    import testlib
ModuleNotFoundError: No module named 'testlib'

[martinpitt]

In order to avoid reintroducing this with the next automatic sorting, can you please put the import parent into its own paragraph, i. e. leave a newline after it?

[lyandrew]

done

[martinpitt]

Thanks!