Don't curl metadata server in userdata example
Don't curl metadata server in userdata example

The metadata server is switched off in
I45ae6d0e3726cc71c7dc35a9a47da8b7a0bab9cb, so this example has been
updated to use os-apply-config to fetch the ssh key instead.

Change-Id: I82b05f9b35ffc6ea2cee9a64d5702c0404cd47de

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