Cinder LVs are monitored by disk util MaaS

[Andy McCrae]

Juno only - RAX technical debt.

With the recent implementation to iterate over all SCSI devices to install maas utilisation alarms, we introduced a new error. This maas disk utilisation does now include cinder attached volumes if you run those playbooks after a system has been handed over. We basically need to amend this logic to exclude all disks with the model "VIRTUAL-DISK"

Backport of https://github.com/rcbops/rpc-openstack/pull/663

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: juno
Review: https://review.openstack.org/255833

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/255833
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible/commit/?id=795daa0ec349288216155be42c139d3ad4c24102
Submitter: Jenkins
Branch: juno

commit 795daa0ec349288216155be42c139d3ad4c24102
Author: Andy McCrae <email address hidden>
Date: Thu Dec 10 12:10:24 2015 +0000

    Don't monitor Cinder Volume LVs for disk util.

    The disk utilisation monitoring will monitor cinder volumes if they are
    attached to an instance and you run the MaaS play again.

    We need to avoid this by ensuring that the model of moniitored disks is
    not 'VIRTUAL-DISK'.

    Change-Id: I6600e0e3cf8949cde332c1139fe6c9e3b0fa85e8
    Closes-Bug: #1524770