kubernetes: expose api_endpoint in EmsKubernetes
kubernetes: expose api_endpoint in EmsKubernetes

This patch refactors EmsKubernetes in order to expose the kubernetes api
endpoint so that it's possible to get the relevant uri from other parts
of the codebase.

Signed-off-by: Federico Simoncelli <d5e4d7da1feaf2c79fa6885a7451e8a6a68321fc@redhat.com>

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