Rename civicrm.settings.php.tpl so it uses a different suffix from Smarty templates

Rename it to civicrm.settings.php.template

When CiviCRM is on Smarty 3, we will want to use http://www.smarty.net/docs/en/api.compile.all.templates.tpl to pre-compile all templates. Since civicrm.settings.php.tpl ends with .tpl and is in the templates directory, Smarty will try to compile that too, even though it is not a template. It can be renamed to not end in .tpl or moved out of the templates directory.

(We are pre-compiling templates as part of our deployment script. The compiled templates will be owned by the deployment user instead of the web server user.)