Deprovision Limesurvey config management and docs

The Limesurvey service hosted at survey.openstack.org was a beta
which saw limited use. The platform it runs on, Xenial, is now EOL
from Ubuntu/Canonical and in order to upgrade to a newer
distribution release we would need to rewrite all the configuration
management (the version of Puppet supported by newer Ubuntu is not
backward-compatible with what we've been running).

If a similar service becomes interesting to users of our
collaboratory in the future, it will need to be reintroduced with
freshly written configuration management anyway. The old configs and
documentation remain in our Git history should anyone wish to use
them as inspiration.

Change-Id: I59b419cf112d32f20084ab93eb6f2417a7f93fdb

manifests/site.pp

@@ -238,25 +238,6 @@ node /^status\d*\.open.*\.org$/ {
   }
 }
 
-# Node-OS: xenial
-node /^survey\d+\.open.*\.org$/ {
-  $group = "survey"
-  class { 'openstack_project::server': }
-
-  class { 'openstack_project::survey':
-    vhost_name              => 'survey.openstack.org',
-    auth_openid             => true,
-    ssl_cert_file_contents  => hiera('ssl_cert_file_contents'),
-    ssl_key_file_contents   => hiera('ssl_key_file_contents'),
-    ssl_chain_file_contents => hiera('ssl_chain_file_contents'),
-    dbpassword              => hiera('dbpassword'),
-    dbhost                  => hiera('dbhost'),
-    adminuser               => hiera('adminuser'),
-    adminpass               => hiera('adminpass'),
-    adminmail               => hiera('adminmail'),
-  }
-}
-
 # Node-OS: xenial
 node /^nb\d+\.open.*\.org$/ {
   $group = 'nodepool'