Default log level of iso8601 should be set to WARN

[Liusheng]

In openstack.common.log, the iso8601's default log level is WARN. But ceilometer doesn't set WARN as default log level of iso8601. This may cause a lot of DEBUG level message recorded in log files if we haven't configured this in ceilometer.conf,like this:

2014-02-25 10:01:50.853 24698 DEBUG iso8601.iso8601 [-] Got u'25' for 'day' with default None to_int /usr/local/lib/python2.7/dist-packages/iso8601/iso8601.py:124
2014-02-25 10:01:50.854 24698 DEBUG iso8601.iso8601 [-] Got u'02' for 'hour' with default None to_int /usr/local/lib/python2.7/dist-packages/iso8601/iso8601.py:124
2014-02-25 10:01:50.854 24698 DEBUG iso8601.iso8601 [-] Got u'01' for 'minute' with default None to_int /usr/local/lib/python2.7/dist-packages/iso8601/iso8601.py:124
2014-02-25 10:01:50.854 24698 DEBUG iso8601.iso8601 [-] Got u'50' for 'second' with default None to_int /usr/local/lib/python2.7/dist-packages/iso8601/iso8601.py:124

The default log level of iso8601 in ceilometer should be set to WARN.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/76075

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/76075
Committed: https://git.openstack.org/cgit/openstack/ceilometer/commit/?id=b3b14a8605068602e8749a48c25c02aeb252e0be
Submitter: Jenkins
Branch: master

commit b3b14a8605068602e8749a48c25c02aeb252e0be
Author: liu-sheng <email address hidden>
Date: Tue Feb 25 10:49:05 2014 +0800

    Set default log level of iso8601 to WARN

    In openstack.common.log, the iso8601's default log level is WARN.
    But ceilometer doesn't set WARN as default log level of iso8601.
    This may cause a lot of DEBUG level message recorded in log files if we
    haven't configured the default log level in ceilometer.conf.

    Change-Id: I8edbcd5f0885b424c70483180b479588bca254a2
    Closes-Bug: #1284412