nova: Die if console TLS enabled with tls-proxy
nova: Die if console TLS enabled with tls-proxy

We require the 'tls-proxy' service to set up certificates for us. Hard
fail if 'NOVA_CONSOLE_PROXY_COMPUTE_TLS' is enabled but the 'tls-proxy'
service is not.

Change-Id: I52fec12b78ecd8f76f835551ccb84dfb1d5b3d8a
Signed-off-by: Stephen Finucane <492121341a95b3c3aab646bed44634f739dd019b@redhat.com>

openstack-dev/devstack,openstack-dev/devstack,nawawi/openstack,nawawi/openstack