context name not set correctly (k8s)

[Yannic Ahrens]

In the configuration fetched from a spawned kubernetes cluster, the context name is set to "default" (see [0]). This causes problems when managing multiple clusters because of name collisions. When I set KUBECONFIG to point to multiple cluster config files only the first context in that list is noticed by kubectl.

$ export KUBECONFIG=$HOME/config-c1:$HOME/config-c2
$ kubectl config get-contexts
CURRENT NAME CLUSTER AUTHINFO NAMESPACE
* default c1 admin

Proposed solution:

Include the cluster name in the context name. Perhaps just use the cluster name as context name as done in [1].

[0]: https://github.com/openstack/python-magnumclient/blob/master/magnumclient/common/utils.py#L206
[1]: https://github.com/openstack/python-magnumclient/blob/master/magnumclient/common/utils.py#L188