event-list should sorts by timestamp, just like API v2 does

[ZhiQiang Fan]

currently, ceilometer event-list will print list and sort by id, but we get response from API v2 which is sorted by timestamp, we should keep consistent

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/146754

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/146754
Committed: https://git.openstack.org/cgit/openstack/python-ceilometerclient/commit/?id=97a200d51dca2108c414a0f36dbfc99c44d71226
Submitter: Jenkins
Branch: master

commit 97a200d51dca2108c414a0f36dbfc99c44d71226
Author: ZhiQiang Fan <email address hidden>
Date: Tue Jan 13 12:12:17 2015 +0800

    event-list should sort by timestamp, not id

    Currently, event-list output will be sorted by message id, that is
    because table field 0 is the default sort field. But sort by id makes
    no sense, and REST API returns events by timestamp order, so let's
    keep consistent with upstream.

    Change-Id: I524b05ed5ff9db34430afd722991d02545c263cb
    Closes-Bug: #1406622