add address argument to login

Christoph Eggersmannrequested to merge
2-login-doesnt-work-in-a-docker-container into main

Closes #2 (closed)

This adds the --address argument to the login function. The default is set to 127.0.0.1, so there are no changes in the way it is currently used.

In Docker you can use

wwukube set-clusters
wwukube login --address 0.0.0.0

to login to the wwukube and use kubectl there.

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