Add nvidia firstboot yaml to tripleo-heat-template
Add nvidia firstboot yaml to tripleo-heat-template

This's a temporary workaround for upgrading Nvidia mellanox NICs
FW and configuring them using mstflint tool

Change-Id: I40166051c10876ee9b865135f219cf0dff6d4c18

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates