Merge "Display filename when encountering bad rule file."

rules/manager.go

@@ -178,7 +178,7 @@ func (m *ruleManager) AddRulesFromConfig(config config.Config) error {
 	for _, ruleFile := range config.Global.RuleFile {
 		newRules, err := LoadRulesFromFile(ruleFile)
 		if err != nil {
-			return err
+			return fmt.Errorf("%s: %s", ruleFile, err)
 		}
 		m.Lock()
 		m.rules = append(m.rules, newRules...)