Another fix due to suddenly deleted public API

[fedinskiy]

Summary

Follow up to [1] caused by the same breaking changes[2].
Added some tests to cover affected scenarios from the TS.

[1] #803
[2] fabric8io/kubernetes-client#4662

Please check the relevant options

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Dependency update
• Refactoring
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• This change requires execution against OCP (use run tests phrase in comment)

Checklist:

• Example scenarios has been updated / added
• Methods and classes used in PR scenarios are meaningful
• Commits are well encapsulated and follow the best practices

[michalvavrik]

run tests

[fedinskiy]

CLi failure in JVM is unrelated, happened today in daily build

[michalvavrik]

@fedinskiy all that stopped me from approving was 2 adapts, but it has to be done this way, correct? please feel free to merge this when you provide little info, thanks

[michalvavrik]

an OC CI finishes, bit busy, sorry

[fedinskiy]

@michalvavrik regarding two adapt calls:
NamespacedOpenShiftClient does not have load method, which we require, and KubernetesClient can not be adapted into OpenShiftClientImpl("No such adapter" exception); as far as I understand, new instances OpenShiftClientImpl can only be produced by NamespacedOpenShiftClient's adapt method.
This is not an example of good API, but that is already in the title of the PR :)

[michalvavrik]

Alright, thanks for context :-)