resource tracker report negative value for memory and vcpu will be confusing

[jichenjc]

2014-05-05 10:51:33.732 4992 AUDIT nova.compute.resource_tracker [-] Free
ram (MB): -1559
2014-05-05 10:51:33.732 4992 AUDIT nova.compute.resource_tracker [-] Free
disk (GB): 29
2014-05-05 10:51:33.732 4992 AUDIT nova.compute.resource_tracker [-] Free
VCPUS: -3

was showed in my compute node logs which make me confusing
we need to avoid this kind of audit logs and give more accurate info

discussions here:
http://lists.openstack.org/pipermail/openstack-dev/2014-May/034312.html

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/93261

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/93261
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=18a2917504cf9be4370243fabc655d0de1656707
Submitter: Jenkins
Branch: master

commit 18a2917504cf9be4370243fabc655d0de1656707
Author: jichenjc <email address hidden>
Date: Fri May 2 02:07:32 2014 +0800

    Adjust audit logs to avoid negative mem/cpu info

    we might have following audit info in the log:
    AUDIT nova.compute.resource_tracker [-] Free ram (MB): -1559
    AUDIT nova.compute.resource_tracker [-] Free disk (GB): 29
    AUDIT nova.compute.resource_tracker [-] Free VCPUS: -3

    which is really confusing to operater and useless
    This patch adjust the log to print phy info and virtual cpus.

    DocImpact

    Change-Id: I2bc63e1aae0787bf976660eed8fd8899bfffe593
    Closes-Bug: #1316916