Heat templates for deploying OpenStack
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The ``NovaHWMachineType`` parameter now defaults ``x86_64`` based instances
to the unversioned ``q35`` machine type. The remaining architecture machine
type defaults being provided directly by OpenStack Nova.
A ``environments/nova-hw-machine-type-upgrade.yaml`` environment file has
been provided to pin ``NovaHWMachineType`` to the previous versioned
machine type defaults during an upgrade.
When the upgrade of the overcloud is complete the following OpenStack Nova
documentation should then be used to ensure a machine type is recorded for
all existing instances before the new ``NovaHWMachineType`` default can be
used in the environment.