Ignore prometheus KubeCPUOvercommit and KubeMemOvercommit alerts

Current master job prometheus-alerts fails with this error:

>       assert count == 0, "Firing alerts: {0}".format(str(alert_names))
E       AssertionError: Firing alerts: ['KubeCPUOvercommit', 'KubeMemOvercommit', 'KubeControllerManagerDown', 'KubeSchedulerDown']

Edited Nov 20, 2019 by Varac

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