Need ability to evacuate host in syspanel

The ability to evacuate a host (known in nova as putting a host into maintenance mode) is only supported for the xenapi virt driver currently. Until at least libvirt is supported, this blueprint is mostly a non-starter.

Targeting to Grizzly with the hopes of working with the Nova team to get broader support for this.
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[02/20/2014] (leandro-i-costantino)

Ideally we are going to add a action button to Hypervisors Table that allows the evacuation of all the instances from specific compute host.

The action button shall be enabled only if the compute-node is 'down'.

This button will open a form that will include:
              * List of target compute hosts where the evacuation can be done. ( not itself, not down, etc)
              * A target compute host named "any", that will be included when the find-host-and-evacuate BP lands into nova. in this case, the scheduler will pick up a target compute host.

This BP is not strictly tied to the nova BP dependency. A change can be added later to include the empty target host.
https://blueprints.launchpad.net/nova/+spec/find-host-and-evacuate-instance
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Review:

https://review.openstack.org/#/c/75940/
Title: Need ability to evacuate host in syspanel

Gerrit topic: https://review.openstack.org/#q,topic:bp/evacuate-host,n,z

Addressed by: https://review.openstack.org/75940
    Need ability to evacuate host in syspanel

Gerrit topic: https://review.openstack.org/#q,topic:bp/mark-host-down-for-maintenance,n,z