Use correct variable for host_access dependency

The keystone::db::mysql resource declares resources using
`$real_allowed_hosts` which is a copy of `$allowed_hosts` minus `$host`.
But then it declares dependencies using `$allowed_hosts` which includes
`$host` and will fail catalog compilation due to a missing dependency

This bug only affects users if the value of `$host` is included in the
array of `$allowed_hosts`

Change-Id: Ifdd8793bcf36178efd1a083ee35649d56dc3d768

manifests/db/mysql.pp

@@ -86,7 +86,7 @@ class keystone::db::mysql(
       mysql_module  => $mysql_module,
     }
 
-    Keystone::Db::Mysql::Host_access[$allowed_hosts] -> Exec<| title == 'keystone-manage db_sync' |>
+    Keystone::Db::Mysql::Host_access[$real_allowed_hosts] -> Exec<| title == 'keystone-manage db_sync' |>
 
   }
 

spec/classes/keystone_db_mysql_spec.rb

@@ -3,7 +3,10 @@ require 'spec_helper'
 describe 'keystone::db::mysql' do
 
   let :pre_condition do
-    'include mysql::server'
+    [
+      'include mysql::server',
+      'include keystone::db::sync'
+    ]
   end
 
   let :facts do