[liqoctl] generate peering-user

[claudiolor]

Description

This PR introduces a set of commands allowing to generate a user with the minimum permissions to create a peering from the cluster with the specified cluster ID.

To create an user with the minimum permissions to peer with the current cluster from a cluster with ID $CLUSTER_ID:

liqoctl generate peering-user --consumer-cluster-id $CLUSTER_ID

to remove all the permissions to the user:

liqoctl delete peering-user --consumer-cluster-id $CLUSTER_ID

[adamjensenbot]

Hi @claudiolor. Thanks for your PR!

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[claudiolor]

/test