Fixing #5258 - Warnings on upgrading/installing some plugins

Warnings occur when installing thold plugin and as such thold will not upgrade correctly

CHANGELOG

@@ -2,6 +2,7 @@ Cacti CHANGELOG
 
 1.2.25
 -issue#5255: Data query xml path with space problem
+-issue#5258: Warnings occur when installing thold plugin and as such thold will not upgrade correctly
 -issue#5259: When the Data Template contains more Data Sources than the Graph Template RRDfiles won't update
 -issue#5263: Warnings in Cacti log when re-indexing devices
 -issue#5272: Boost continues to loose data when archive tables are missed due to overloaded MariaDB

lib/plugins.php

@@ -1056,7 +1056,7 @@ function api_plugin_valid_entrypoint($plugin, $function) {
 	// Check for invalid entrypoint install/upgrade
 	$backtrace = debug_backtrace();
 	if (cacti_sizeof($backtrace)) {
-		if (!preg_match('/(install|upgrade)/i', $backtrace[2]['function'])) {
+		if (!preg_match('/(install|upgrade|setup)/i', $backtrace[2]['function'])) {
 			cacti_log(sprintf('WARNING: Plugin \'%s\' is attempting to call \'%s\' improperly in function \'%s\'', $plugin, $function, $backtrace[2]['function']), false, 'PLUGIN');
 			return false;
 		}