Revert back to latin1 for default mysql db charset

utf8 as a default prevents the database from being created (MyISAM does
not support indexes with more than 1000 bytes).
The 'nova db sync' command later upgrades the database/tables to utf8
and InnoDB.

manifests/db/mysql.pp

@@ -19,7 +19,7 @@ class nova::db::mysql(
     user         => $user,
     password     => $password,
     host         => $host,
-    charset      => 'utf8',
+    charset      => 'latin1',
     # I may want to inject some sql
     require      => Class['mysql::server'],
   }