[cli] no cli support for OpenStack update

[Aleksey Kasatkin]

CLI support is needed for OpenStack update/rollback operations.

[Dmitry Borodaenko (angdraug)]

OpenStack update/rollback is a feature, so this should be a blueprint and not a bug.

[Ihor Kalnytskyi (ikalnytskyi)]

OpenStack update/rollback is a feature, but if we can't run this task from CLI it's a bug.
Moreover, OpenStack patching is in master already. So I think it's better to make improvements via bugs.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/103175

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/103175
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=4a805dfa108c1768441c59dfac0c67d20b5d57e1
Submitter: Jenkins
Branch: master

commit 4a805dfa108c1768441c59dfac0c67d20b5d57e1
Author: Artem Roma <email address hidden>
Date: Fri Jun 27 18:46:30 2014 +0300

    Support for update operation to fuelclient added

    What is done:
    - New method `update` that represents flag for `fuel env` command added
      to `actions.Environment` object;
    - all needed mappings to include new operation into parsing system added
      into `argument.py` file;
    - tests updated;

    Change-Id: Ibfc35d01a19d4848b84201197b912169848e3419
    Closes-Bug: #1330910