Inspector should check the domain state before inspecting nics and disks

[Liusheng]

In my devstack environment(compute virt driver is libvirt), there is a shut-off instance. The ceilometer-agent-compute will record the following text in log every time of inspecting nics or disks,and inspect faild:

http://paste.openstack.org/show/61661/

I think the inspector of ceilometer should check the domain state before inspecting nics of disks,and record more conciser log message in log file.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/68882

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/68882
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=39f13fa706e79f1d56694d1c027b0f808ed5a68e
Submitter: Jenkins
Branch: master

commit 39f13fa706e79f1d56694d1c027b0f808ed5a68e
Author: liu-sheng <email address hidden>
Date: Fri Jan 24 18:03:29 2014 +0800

    check domain state before inspecting nics/disks

    If there are shutoff instances,the ceilometer-inspector vill
    inspect faild,and record the tedious error string in log.
    The inspector of ceilometer should check the domain state before
    inspecting nics and disks,and record more conciser log message in log file.

    Change-Id: Id56bf75b47edf1f3b4ba77f40a48d83186d0afb6
    Closes-bug: #1271454