Harvester uses active-backup as the default bond mode

Ref: https://github.com/harvester/harvester/issues/2472

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Verify Steps:

  1. Install Harvester via ISO
  2. The default Bond Mode should select active-backup
  3. Ater installed with active-backup mode, login to console
  4. Execute cat /etc/sysconfig/network/ifcfg-harvester-mgmt, BONDING_MODULE_OPTS should contains mode=active-backup