POD VM fails deleting on AARCH64

[Patricia Domingues]

MAAS doesn't delete pod VM from the host on AARCH64.
Log shows as deleted and interface doens't show it, but
it is still in the host.

steps:
a. create a virsh pod
b. compose and deploy a machine
c. delete machine via MAAS interface

infos:
maas.log
Jun 19 15:31:57 d05-3 maas.node: [info] unique-cod: Decomposing machine
Jun 19 15:31:58 d05-3 systemd[1]: Started Session 11922 of user ubuntu.
Jun 19 15:31:59 d05-3 maas.drivers.pod.virsh: [error] Failed to get pod CPU speed
Jun 19 15:31:59 d05-3 libvirtd[15047]: 2018-06-19 15:31:59.843+0000: 15047: error : virNetSocketReadWire:1811 : End of file while reading data: Input/output error
Jun 19 15:31:59 d05-3 maas.node: [info] unique-cod: Deleting machine
...
Jun 19 15:32:13 d05-3 sh[54914]: #011 * removed node unique-cod

but VM is still in the host:
~$ sudo virsh list --all
 Id Name State
----------------------------------------------------
 - unique-cod shut off

when try to delete it:
$ sudo virsh undefine unique-cod
error: Failed to undefine domain unique-cod
error: Requested operation is not valid: cannot undefine domain with nvram

but it works adding '--nvram': "sudo virsh undefine unique-cod --nvram"

Output from "dpkg -l '*maas*'|cat":
||/ Name Version Architecture Description
+++-===============================-===================================-============-=================================================
ii maas 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all "Metal as a Service" is a physical cloud and IPAM
ii maas-cli 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all MAAS client and command-line interface
un maas-cluster-controller <none> <none> (no description available)
ii maas-common 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all MAAS server common files
ii maas-dhcp 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all MAAS DHCP server
ii maas-dns 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all dummy transitional package for MAAS DNS server
ii maas-proxy 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all MAAS Caching Proxy
ii maas-rack-controller 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all Rack Controller for MAAS
ii maas-region-api 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all Region controller API service for MAAS
ii maas-region-controller 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all Region Controller for MAAS
un maas-region-controller-min <none> <none> (no description available)
un python-django-maas <none> <none> (no description available)
un python-maas-client <none> <none> (no description available)
un python-maas-provisioningserver <none> <none> (no description available)
ii python3-django-maas 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all MAAS server Django web framework (Python 3)
ii python3-maas-client 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all MAAS python API client (Python 3)
ii python3-maas-provisioningserver 2.5.0~alpha1-7040-g9bdbbc8-0ubuntu1 all MAAS server provisioning libraries (Python 3)

[Newell Jensen (newell-jensen)]

This is actually no architecture specific as my libvirt host, amd64, also supports the --nvram flag for the `undefine` command.