feat: VM provisioning, and reboot_host on ESXi

create_vm_from_cloud_init takes the same qcow2/raw cloud images netOrk
offers for Proxmox. ESXi can neither boot nor download them, so the
driver does both: download with checksum check and one retry, convert
with qemu-img to a streamOptimized VMDK (cached by URL), import through
a minimal OVF descriptor over NFC, pin requested MACs, grow the disk,
and attach a NoCloud seed ISO placed next to the VM's files. NoCloud
rather than guestinfo because it needs nothing in the guest; the
user-data installs open-vm-tools, which the driver declares as its
guest agent. A failure after the import removes the VM again.

Placement is a pure decision over inventory rows: a connected host
outside maintenance mode that sees the datastore and every port group,
with the resource pool and VM folder found by walking up to the
datacenter -- one path for a standalone host and for a vCenter.

Two faults vcsim surfaced and the tests now pin: a chunked upload body
next to a Content-Length is refused with 500, so the disk goes up as a
sized file object that also reports lease progress; and a device edit
replaces the device as sent, so disk and NIC edits start from the live
objects, backing included (vcsim panicked on a disk without one).

destroy_vm, get_vm_status, get_network_targets (port groups with their
fixed VLAN) and get_image_storages complete the contract.

reboot_host on ESXi uses RebootHost_Task and refuses outside
maintenance mode: force=True would cut power to running VMs.

Tested against vcsim in ESXi and vCenter mode, end to end.

napalm_vmware/base.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from pathlib import Path
 from typing import Any, ClassVar
 
 from napalm.base.exceptions import ConnectionException
@@ -22,6 +23,7 @@ from napalm_vmware.parse.storage import storage_pools
 from napalm_vmware.parse.vm_config import vm_config
 from napalm_vmware.parse.vms import vm_list
 from napalm_vmware.parse.warnings import host_warnings
+from napalm_vmware.provision.image import DEFAULT_CACHE_DIR
 
 _DEFAULT_PORT = 443
 #: ``about.apiType`` -> the driver that handles it, for a helpful refusal.
@@ -55,6 +57,8 @@ class VmwareBaseDriver(HypervisorDriver):
         args = optional_args or {}
         self._port = int(args.get("port") or _DEFAULT_PORT)
         self._verify_ssl = bool(args.get("verify_ssl", args.get("ssl_verify", True)))
+        # Where converted cloud images are kept between provisioning jobs.
+        self._image_cache_dir = Path(args.get("image_cache_dir") or DEFAULT_CACHE_DIR)
         self._si: Any = None
         self._inventory: Any = None