Bug: Miss leading Error with current-context

[oliverbaehler]

A missleading error is thrown when the current-context field is set in the referenced kubeconfig:

TRAC[0000] Loading targets from inventory.               filter=".*" group-vars-dir=group_vars limits=
TRAC[0000] Successfully loaded targets from inventory.   targets=1
TRAC[0000] Loading playbooks for targets.                load-cluster-inventory=true playbook-file=playbook.yml spruce-eval=true
ERRO[0000] Failed to compile playbooks.                  error="Failed to create playbook for target 'harvester-01': 'failed to retrieve cluster-inventory: invalid configuration: [context was not found for specified context: harvester-01, cluster has no server defined]'"
error: Failed to create playbook for target 'harvester-01': 'failed to retrieve cluster-inventory: invalid configuration: [context was not found for specified context: harvester-01, cluster has no server defined]'

After deleting the value of current-context this error no longer occours.