Instance show SUSPENDED state but in fact suspend action do not implemented on PowerVM

[Qing Xin Meng]

The PowerVM don't supported suspend/resume actions now.
But after running 'nova suspend instance-name', the instance state changed to SUSPENDED, and no any notification in compute.log, it's a problem, the state should be still ACTIVE and will explain the reason in compute.log.

+--------------------------------------+----------------------------+--------+------------------+
| ID | Name | Status | Networks |
+--------------------------------------+----------------------------+--------+------------------+
| 42687c37-b0b4-4cf9-ada5-a67688add4be | m2 | SUSPENDED | mqx_net=55.0.0.2 |

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/38259

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/38259
Committed: http://github.com/openstack/nova/commit/02ae8a091dc611bc90a7e975c83f53e5fa579fdc
Submitter: Jenkins
Branch: master

commit 02ae8a091dc611bc90a7e975c83f53e5fa579fdc
Author: QingXin Meng <email address hidden>
Date: Wed Jul 17 16:35:59 2013 -0700

    Unimplemented suspend/resume should not change vm state

    When the underlying virt driver does not implement the suspend/resume API
    and raises a NotImplementedError, the compute manager will error out and
    change the instance's vm_state to ERROR. With this change, the compute
    manager will handle the NotImplementedError and keep the instance
    vm_state as it was before the error.

    Change-Id: I8150a898fee91bbe66f1502638baca8050e2dd6d
    Fixes: bug #1203986