[host-ocp4-assisted-installer] Add the option to add extra disks to masters and/or workers

[agonzalezrh]

SUMMARY

Two new variables are added:

ai_masters_extra_disks: []
ai_workers_extra_disks: []

INSTANCENAME text will be replaced with the name of the instance, to avoid duplicate names

Example:

ai_workers_extra_disks:
  - metadata:
      name: "extradiskINSTANCENAME"
    spec:
      source:
        blank: {}
      pvc:
        accessModes:
          - ReadWriteMany
        volumeMode: Block
        resources:
          requests:
            storage: "20Gi"

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

host-ocp4-assisted-installer role