Share openshift tokens across openshift clients

[shawkins]

If the adapt call is made multiple times, this will create different OpenShiftOAuthInterceptors - each will maintain it's own token.

Originally posted by @shawkins in #4673 (comment)

[shawkins]

This affects usage where the user needs an openshift client, but initially is provided with just the base kuberenetes client. This should not be typical. It's more likely that the instance is already an openshift client, which is also the workaround to this issue - make sure the root client that is passed around is the openshift client.

[shawkins]

Resolved via #4698 - we may revisit this so that a direct config value is not used for this sharing.