pt-k8s-debug-collector should not collect passwords

- apiVersion: v1
  data:
    clustercheck: alRNVTBqbjlMbUtqNmxVOA==
    monitor: Q3pTc3Ztb0ZFTWhrSUxJQg==
    operator: ZW1maUhtcUMyM2Fwc3RQS3g=
    proxyadmin: Qm50dU5mVmJOYmVIeGN2Nkc=
    root: VmIwckNHVXlvU2F2cGJWSnA=
    xtrabackup: dXRSUk93RTVXdGJuRnhnU3Rlbw==
  kind: Secret
  metadata:
    annotations:
      grant-for-1.6.0-monitor-user: done
    creationTimestamp: "2021-01-20T03:10:47Z"
    managedFields:
    - apiVersion: v1
      fieldsType: FieldsV1
      fieldsV1:
        f:data:
          .: {}
          f:clustercheck: {}
          f:monitor: {}
          f:operator: {}
          f:proxyadmin: {}
          f:root: {}
          f:xtrabackup: {}
        f:metadata:
          f:annotations:
            .: {}
            f:grant-for-1.6.0-monitor-user: {}
        f:type: {}
      manager: percona-xtradb-cluster-operator
      operation: Update
      time: "2021-01-20T03:12:15Z"
    name: internal-cluster1
    namespace: default
    resourceVersion: "11458"
    selfLink: /api/v1/namespaces/default/secrets/internal-cluster1
    uid: ab3df45c-4dd0-42bf-976d-681e32897402
  type: Opaque