feat: Intel AMT driver over WS-Management (0.1.0)

An `amt` driver (napalm_amt.AmtDriver), a ManagementControllerDriver for the
management controller of Intel vPro machines, with its own lean WS-Management
client (requests + ElementTree, HTTP Digest, ports 16992/16993).

It reads the machine's identity, hardware with the SMBIOS system UUID, firmware
(AMT with build, BIOS), power state and the hardware event log, reports what AMT
listens on (plain HTTP or TLS, KVM incl. port 5900, IDE-R), and switches the
machine's power. AMT cannot be reset over WS-Management, so there is no
reboot_host. Discovery recognises AMT by its ports and its Server header.

Tested against Intel's published AMT 12 recordings (go-wsman-messages,
Apache-2.0, see NOTICE). `python -m napalm_amt.record` records a real AMT
read-only; the first test devices are two Lenovo ThinkCentre M910x.

tests/fixtures/dmt-wsman-messages/COMMANDS.txt

@@ -0,0 +1,30 @@
+# Intel AMT 12.0.67 (build 1579) on an Intel NUC9 (NUC9V7QNB, i7-9850H), as published in
+# Intel's go-wsman-messages (Apache-2.0), pkg/wsman/wsmantesting/responses, commit 00402b9.
+# Some values there were replaced by placeholders (AMT_GeneralSettings: "Test Host Name").
+#
+# file                                               request
+AMT_GeneralSettings.get.xml                          Get AMT_GeneralSettings
+AMT_GeneralSettings.enumerate.xml                    Enumerate AMT_GeneralSettings (shape of every EnumerateResponse)
+AMT_EthernetPortSettings.pull.xml                    Enumerate + Pull AMT_EthernetPortSettings
+AMT_SetupAndConfigurationService.get.xml             Get AMT_SetupAndConfigurationService
+AMT_SetupAndConfigurationService.GetUuid.xml         Invoke AMT_SetupAndConfigurationService.GetUuid
+AMT_TLSSettingData.pull.xml                          Enumerate + Pull AMT_TLSSettingData
+AMT_RedirectionService.get.xml                       Get AMT_RedirectionService
+AMT_MessageLog.PositionToFirstRecord.xml             Invoke AMT_MessageLog.PositionToFirstRecord
+AMT_MessageLog.GetRecords.xml                        Invoke AMT_MessageLog.GetRecords
+IPS_KVMRedirectionSettingData.get.xml                Get IPS_KVMRedirectionSettingData
+CIM_KVMRedirectionSAP.pull.xml                       Enumerate + Pull CIM_KVMRedirectionSAP
+CIM_SoftwareIdentity.pull.xml                        Enumerate + Pull CIM_SoftwareIdentity
+CIM_BIOSElement.pull.xml                             Enumerate + Pull CIM_BIOSElement
+CIM_Chassis.pull.xml                                 Enumerate + Pull CIM_Chassis
+CIM_Card.pull.xml                                    Enumerate + Pull CIM_Card
+CIM_ComputerSystemPackage.pull.xml                   Enumerate + Pull CIM_ComputerSystemPackage
+CIM_Processor.pull.xml                               Enumerate + Pull CIM_Processor
+CIM_Chip.pull.xml                                    Enumerate + Pull CIM_Chip (first page: a context, no EndOfSequence)
+CIM_PhysicalMemory.pull.xml                          Enumerate + Pull CIM_PhysicalMemory
+CIM_MediaAccessDevice.pull.xml                       Enumerate + Pull CIM_MediaAccessDevice
+CIM_AssociatedPowerManagementService.pull.xml        Enumerate + Pull CIM_AssociatedPowerManagementService
+CIM_PowerManagementService.RequestPowerStateChange.xml  Invoke CIM_PowerManagementService.RequestPowerStateChange
+#
+# Written by hand after DSP0226 (WS-Management) section 14, not recorded:
+fault_destination_unreachable.xml                    the fault for a resource URI the service does not know