Revert "Refactor datastores to classes (#9179)" (#11273)

This reverts commit e5dad7a64e.

poll-billing.php

@@ -11,8 +11,6 @@
  * @copyright  (C) 2006 - 2012 Adam Armstrong
  */
 
-use LibreNMS\Data\Store\Datastore;
-
 $init_modules = array();
 require __DIR__ . '/includes/init.php';
 
@@ -24,7 +22,6 @@ if (isset($argv[1]) && is_numeric($argv[1])) {
 }
 
 set_debug(isset($options['d']));
-Datastore::init();
 
 // Wait for schema update, as running during update can break update
 if (get_db_schema() < 107) {
@@ -32,6 +29,8 @@ if (get_db_schema() < 107) {
     exit(1);
 }
 
+rrdtool_initialize();
+
 $poller_start = microtime(true);
 echo "Starting Polling Session ... \n\n";
 
@@ -165,4 +164,4 @@ if ($poller_time > 300) {
 }
 echo "\nCompleted in $poller_time sec\n";
 
-Datastore::terminate();
+rrdtool_close();