grizzly: new tempdir option in nova

[Tom Fifield]

If https://review.openstack.org/#/c/20288 is merged, a new option is added to nova in grizzly.

   79 cfg.StrOpt('tempdir',
   80 default=None,
   81 help='Explicitly specify the temporary working directory'),

nova.conf samples, and config option references should be updated

[Tom Fifield (fifieldt)]

Although the temporary directory used can be controlled via
environment variables, this patch provides a way to define it
explicitly via a config option.

The default value is None, which behaves per the doc below:
http://docs.python.org/2/library/tempfile.html#tempfile.tempdir

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/24054

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/24054
Committed: http://github.com/openstack/openstack-manuals/commit/afa8bb793a91aab22485129efc3ded806b467e24
Submitter: Jenkins
Branch: master

commit afa8bb793a91aab22485129efc3ded806b467e24
Author: Tom Fifield <email address hidden>
Date: Mon Mar 11 22:00:59 2013 +1100

    Doc nova tempdir flag

    fixes bug 1106394

    tempdir is a new option in grizzly, as documented

    patch2 makes explicit that the default value is none

    Change-Id: Ia528b622b4783e01eb1a55e5e897ee00a90e7bd7