Allow Nova to talk to Cinder using a self-signed cert

[Rick Harris]

`cinderclient` has an `insecure` option which will avoid cert-verification, necessary if using a self-signed cert.

We should expose this option through Nova, with a sensible default being to verify certs.

[Davanum Srinivas (DIMS) (dims-v)]

we can follow the same pattern as used by glance.py to talk to glance (see 'glance_api_insecure' option)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/19861

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/19861
Committed: http://github.com/openstack/nova/commit/4aeecd5c7e91418866e29becd473d0230f0b8318
Submitter: Jenkins
Branch: master

commit 4aeecd5c7e91418866e29becd473d0230f0b8318
Author: Cory Stone <email address hidden>
Date: Wed Jan 16 16:00:49 2013 -0600

    Allow nova to use insecure cinderclient.

    Add an option cinder_api_insecure to pass on to cinderclient.

    Bug 1100459

    Change-Id: Ifb31cc0df48d2345fa0a6ec440bdf9685254cbcd