[FEATURE] Make the openshift_server_url input optional

[Lamoureux6]

Is your feature request related to a problem? Please describe.

As pointed out in the OpenShift documentation on how to use a service account, see step #2 of the section titled "Using a service account’s credentials externally". The API token generated for service account allows login using only the token, omitting the server url.

Describe the solution you'd like

It would be nice if the input openshift_server_url of this action was optional.

Describe alternatives you've considered

Alternative is to put the server url, which is more likely to change than the token itself in our use case.

Additional context