error reporting memory and CPU resources in scripts/malcolm_kubernetes.py

[mmguero]

transferred from cisagov#299, thanks to @ya0guang

Here is a code snippet in function pod_stats:

---

                cpu = 0
                mem = 0
                cpu_mem = stats_api.get_namespaced_custom_object(
                    "metrics.k8s.io", "v1beta1", namespace, "pods", pod_name
                )
                for c in cpu_mem['containers']:
                    if c['usage']['cpu'] == '0':
                        pass
                    else:
                        cpu = +int(c['usage']['cpu'][:-1])
                cpu = str(cpu) + 'n'
                cpu = _nanocore_to_millicore(cpu)
                for m in cpu_mem['containers']:
                    mem = +int(m['usage']['memory'][:-2])
                mem = str(mem) + 'Ki'
                mem = _to_gibibyte_or_mebibyte(mem)

Should cpu = +int(c['usage']['cpu'][:-1]) be cpu += int(c['usage']['cpu'][:-1])? Similarly, mem = +int(m['usage']['memory'][:-2]) may also be mem += int(m['usage']['memory'][:-2])?

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