powervm driver needs to support reboot operation

[Matt Riedemann]

The reboot operation is part of the core nova API but the powervm driver doesn't support it:

https://github.com/openstack/nova/blob/master/nova/virt/powervm/driver.py#L126

https://wiki.openstack.org/wiki/HypervisorSupportMatrix

This is a pretty basic operation that should be supported if the driver is to be considered valid.

Looking here:

http://pic.dhe.ibm.com/infocenter/powersys/v3r1m5/topic/iphcg/chsysstate.htm

It should be a pretty straight-forward operation:

"To perform an immediate restart of a partition (operator panel function 3):

chsysstate -r lpar -o shutdown --immed --restart { -n Name | --id PartitionID } [ -m ManagedSystem ]"

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/40748

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/40748
Committed: http://github.com/openstack/nova/commit/05e0ceb242f16a236f3c793305ed24e1f9a43efb
Submitter: Jenkins
Branch: master

commit 05e0ceb242f16a236f3c793305ed24e1f9a43efb
Author: Matt Riedemann <email address hidden>
Date: Wed Aug 7 14:56:32 2013 -0700

    Implement hard reboot for powervm driver

    Implements the OS reboot API in the powervm driver. Soft reboot is not
    supported as it requires additional configuration on the LPAR when it's
    spawned so this patch simply performs an immediate hard reboot.

    Also adds tests for start_lpar and stop_lpar which didn't exist before.

    Closes-Bug: #1205089

    Change-Id: Iad64dda79f46d18c7aa5bee12ed41e7a01853d34