Terminate Instance button doesn't work

Bug associated with Bootstrap 3 upgrade:
https://review.openstack.org/#/c/107042/ >
openstack_dashboard/dashboards/project/instances/tables.py
the addition of the "ajax-modal" css class to TerminateInstance is
causing the problems. We did not have this class before.

Change-Id: I30e28120d9766ada56a9d179ed7ac17f8b2ad6e5
Closes-Bug: #1349608
Merge "Terminate Instance button doesn't work"