powervm: get_host_uptime output doesn't match convention

[Mathew Odden]

Change I67aaf6a5: Implement get_host_uptime for powervm driver was just merged, but reports the uptime in a format that isn't consistent with other hypervisors. The driver should follow convention and report uptime as the full returned string. An example of this from the libvirt driver:

root@idpx31:~# nova hypervisor-uptime 1
+---------------------+-----------------------------------------------------------------------+
| Property | Value |
+---------------------+-----------------------------------------------------------------------+
| uptime | 13:56:17 up 10 days, 23:07, 1 user, load average: 2.36, 2.23, 2.25 |
| | |
| id | 1 |
| hypervisor_hostname | ************ |
+---------------------+-----------------------------------------------------------------------+

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/35169

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/35169
Committed: http://github.com/openstack/nova/commit/84c5e4a08a668a3d691374a1f396d4e761094ec4
Submitter: Jenkins
Branch: master

commit 84c5e4a08a668a3d691374a1f396d4e761094ec4
Author: Matt Riedemann <email address hidden>
Date: Mon Jul 1 11:20:26 2013 -0700

    powervm: make get_host_uptime output consistent with other virt drivers

    The powervm driver was filtering out part of the uptime information so
    that only system uptime was returned, not the number of users, load,
    etc. The hypervisor API sample and the libvirt driver provide the full
    uptime output, so this patch makes the powervm driver follow that
    convention.

    Fixes bug 1196630

    Change-Id: I24134270cab9df97ff59c06e057406b4aa09992a