Deprecate --no-cache in favor of --os-cache

[Dan Prince]

The existing --no-cache option in python-novaclient is not very user friendly in that its default forces users to use python-keyring to cache auth tokens. Users have expressed the desire to 'opt-in' for this behavior instead of having it automatically on.

Additionally the existing --no-cache option is a bit confusing as well... and might work better if it were named --os-cache for consistency with the other --os (auth related) flags.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/17692

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/17692
Committed: http://github.com/openstack/python-novaclient/commit/e483455a1281412a8b38a483a3f167a2fd27f5d9
Submitter: Jenkins
Branch: master

commit e483455a1281412a8b38a483a3f167a2fd27f5d9
Author: Dan Prince <email address hidden>
Date: Fri Dec 7 11:47:49 2012 -0500

    Adds --os-cache to replace old --no-cache.

    Deprecates the old --no-cache option in favor of --os-cache.

    The old CLI args (--no_cache and --no-cache) and ENV option
    (OS_NO_CACHE) are still supported but no longer show up
    in help.

    The new option for --os-cache can also be set via the OS_CACHE ENV
    variable... which now defaults to False. This should be much more user friendly.

    Fixes LP Bug #1087776.

    Change-Id: I3cea089c7e11ce75f22c2d7f3242b02b80441323