Nova: Remove manifest for nova-serialproxy
Nova: Remove manifest for nova-serialproxy

This manifest was added several cycles ago[1], but it has never been
actually used since then.

[1] b0515a8984a015518316d1389d86839cc8747c8c

Change-Id: I341902c7f17b6a21dd789aaccae31b02bf4b0a8b

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo