rename cpumodel to cpu_model

[TGM]

Description

The parameter requires an _ https://github.com/OpenNebula/terraform-provider-opennebula/pull/454

New or affected resources and data sources

cpumodel cpu_model

Potential terraform configuration

cpu_model {
    model = "host-passthrough"
  }

References

https://github.com/OpenNebula/terraform-provider-opennebula/pull/454

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