timeutils should be used in place of time methods in utils.py

[Vish Ishaya]

As part of the move to openstack-common, we have timeutils. They should be used in place of the time methods in utils.py

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/8219

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/8219
Committed: http://github.com/openstack/nova/commit/9ff3121bd90133fb3b37c0e10407b5f7ade26b90
Submitter: Jenkins
Branch: master

commit 9ff3121bd90133fb3b37c0e10407b5f7ade26b90
Author: Zhongyue Luo <email address hidden>
Date: Wed Jun 6 10:32:49 2012 +0800

    Replaces functions in utils.py with openstack/common/timeutils.py

    Fixes bug #1008628

    1. Edit openstack-common.conf and import nova/openstack/common/timeutils.py
    2. Move time related functions from utils.py to timeutils.py
    3. Replace following functions in utils.py with timeutils.py
    - isotime
    - parse_isotime
    - strtime
    - parse_strtime
    - normalize_time
    - is_older_than
    - utcnow_ts
    - utcnow
    - set_time_override
    - advance_time_delta
    - advance_time_seconds
    - clear_time_override
    4. Remove datetime related functions and datetime related unittests

    Change-Id: I9a92be286fb071b6237dd39495d88dae106e2ce0