Fix QEMU delete errors

[spowelljr]

Sometimes QEMU was returning two JSON objects in the response and minikube was failing to unmarshal the response as it's only expecting one JSON object.

Response:

{"return": {}}
{"timestamp": {"seconds": 1663094607, "microseconds": 836663}, "event": "SHUTDOWN", "data": {"guest": false, "reason": "host-qmp-quit"}}

Split the response on \n and only unmarshal the first JSON object.

Also wrapped returns on all the errors for better logging.

[k8s-ci-robot]

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This pull-request has been approved by: klaases, medyagh, spowelljr

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[klaases]

Great to see error wrapping for better logging.