Fix dependency to purge default vhost config

It turned out defining dependency for openstacklib::wsgi::apache
doesn't properly enforce resource order and the default vhost file
is not purged properly.
This change adds the more explicit dependency to enforce the order
properly.

Change-Id: I43599cd9ad217b78da3d7c86ed106f6fc57c58f2

manifests/wsgi/apache.pp

@@ -127,12 +127,15 @@ class placement::wsgi::apache (
   }
   $ssl_real = pick($ssl, true)
 
+  include placement::deps
   include placement::params
 
   if $ensure_package != undef {
     warning('The placement::wsgi::apache::ensure_package parameter is deprecated and has no effect')
   }
 
+  Anchor['placement::install::end'] -> Class['apache']
+
   ::openstacklib::wsgi::apache { 'placement_wsgi':
     bind_host                 => $bind_host,
     bind_port                 => $api_port,
@@ -161,7 +164,6 @@ class placement::wsgi::apache (
     access_log_file           => $access_log_file,
     access_log_format         => $access_log_format,
     error_log_file            => $error_log_file,
-    require                   => Anchor['placement::install::end'],
   }
 
 }