The powervm driver should log ssh stderr as warning rather than debug

[Matt Riedemann]

There are 4 methods in the powervm driver that run ssh calls to the backing hypervisor (2 in blockdev, 2 in operator) and check for stderr output but only log it at debug level, which could be masking more serious issues. The stderr results should be logged at warning instead.

https://github.com/openstack/nova/blob/master/nova/virt/powervm/blockdev.py#L563
https://github.com/openstack/nova/blob/master/nova/virt/powervm/blockdev.py#L580

https://github.com/openstack/nova/blob/master/nova/virt/powervm/operator.py#L694
https://github.com/openstack/nova/blob/master/nova/virt/powervm/operator.py#L711

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/43651

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/43651
Committed: http://github.com/openstack/nova/commit/43e102cc215aabc72a0ef84cf48965c4db2d58d4
Submitter: Jenkins
Branch: master

commit 43e102cc215aabc72a0ef84cf48965c4db2d58d4
Author: Subashini Soundararajan <email address hidden>
Date: Mon Aug 26 17:58:26 2013 -0700

    Powervm driver now logs ssh stderr to warning

    The run_vios_command, run_vios_command_as_root methods in
    blockdevice.py and operator.py of powervm driver currently log
    stderr at debug level, this commit changed it to log to warning
    level rather than debug.

    Closes-Bug: #1215019
    Change-Id: I903067476049ead01c6c34392342d915917790b3