Need ability to evacuate host in syspanel

Implement host evacuate in the hypervisors panel.
An extra tab was added to show in the first one hypervisors
and on the second one compute host. on each compute host
that is down an evacuate host button was added.
If the user press the button a modal windows is shown to
request the needed data to perform the evacuation.

blueprint evacuate-host

Co-Authored-By: Leandro Costantino <leandro.i.costantino@intel.com>
Co-Authored-By: David Lyle <david.lyle@hp.com>

Change-Id: I57a16f99fddd84c287429085c7e90beb59a17aa3
Merge "Need ability to evacuate host in syspanel"