feat(provisioning): accept cpu_type, and refuse one that cannot be honoured

napalm_device_types' create_vm_from_cloud_init gained cpu_type, the CPU model
a new VM gets (netork#494). VMware sets CPU compatibility per cluster (EVC),
not per VM, and this driver has no get_vm_cpu_types() to offer a model, so
None is the only value it can honour. Anything else raises ValueError before
the image is fetched rather than being dropped silently.

napalm_vmware/provisioning.py

@@ -147,9 +147,14 @@ class VmwareProvisioningMixin:
         ssh_public_keys: list[str] | None = None,
         disk_resize_gb: int | None = None,
         storage: str | None = None,
+        cpu_type: str | None = None,
         download_timeout: int = 300,
         timeout: int = 180,
     ) -> VMProvisionResultDict:
+        if cpu_type is not None:
+            # CPU compatibility is a cluster setting here (EVC), not a per-VM
+            # one, and there is no get_vm_cpu_types() that could offer a model.
+            raise ValueError(f"VMware cannot give a single VM a CPU type ({cpu_type!r})")
         self._check_nics(nics)
         try:
             vmdk, image_size = ImageCache(self._image_cache_dir).vmdk(