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Add playbooks and scripts to aid in performing maintainence on hypervisors

John M.F. Garbutt requested to merge johng-merge-upstream-into-staging into arcus/train-production

These may be used to perform package updates that require a reboot:

  • disable compute service (nova-compute-disable.yml)
  • live migrate VMs away (nova-compute-drain.yml)
  • reboot (reboot.yml)
  • enable compute service (nova-compute-enable.yml)

They may also be used to drain a compute node before a rebuild:

  • disable compute service (nova-compute-disable.yml)
  • live migrate VMs away (nova-compute-drain.yml)
  • stop services (kayobe overcloud service stop)

(cherry picked from commit 45fb5c60)

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