Unpin cheetah dependency version

[Mark McLoughlin]

We've been pinned to the same version of Cheetah since May 2011:

  Cheetah==2.4.4

this was released in December 2010 and there hasn't been a release since:

  https://pypi.python.org/pypi/Cheetah/2.4.4

There's no particular reason to believe a future release of Cheetah will break us (only 6 commits since 2.4.4 and they all look like bugfixes), so we should change to:

  Cheetah>=2.4.4

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/22965

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/22965
Committed: http://github.com/openstack/nova/commit/341b59531f73fb9d3575160496fb34f57bb01b1e
Submitter: Jenkins
Branch: master

commit 341b59531f73fb9d3575160496fb34f57bb01b1e
Author: Mark McLoughlin <email address hidden>
Date: Tue Feb 26 11:10:01 2013 +0000

    Unpin Cheetah dependency version

    Fixes bug #1133216

    We've been pinned to the same version of Cheetah since May 2011:

      Cheetah==2.4.4

    this was released in December 2010 and there hasn't been a release since:

      https://pypi.python.org/pypi/Cheetah/2.4.4

    There's no particular reason to believe a future release of Cheetah will break
    us (only 6 commits since 2.4.4 and they all look like bugfixes), so we should
    change to:

      Cheetah>=2.4.4

    Change-Id: Id3b22b84d2d693776f89ccb1d0c99d4e42fcab62