support disable_terminate for instance

[lvdongbing]

With 'disable_terminate' option, we can protect instance from being accidentally terminated,
but now, nova dosen't support to it.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/108955

[melanie witt (melwitt)]

This functionality is already provided by the lock admin action:

http://developer.openstack.org/api-ref-compute-v2-ext.html#ext-action

and can also work for a user because of this patch "Allow user and admin lock of an instance":

https://review.openstack.org/#/c/38196/

[melanie witt (melwitt)]

This functionality is already provided by the 'nova lock' command:

http://docs.openstack.org/user-guide/content/novaclient_commands.html#novaclient_subcommand_lock

[OpenStack Infra (hudson-openstack)]

Change abandoned by Sean Dague (<email address hidden>) on branch: master
Review: https://review.openstack.org/108955
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.