Properly deal with classes destructors

There are some classes such as AuditLog that demands a reference count. That is
needed because this class can be used by different instances of the Rules
classes.

src/audit_log_writer_parallel.cc

@@ -69,11 +69,6 @@ bool AuditLogWriterParallel::init() {
 }
 
 
-bool AuditLogWriterParallel::close() {
-    return true;
-}
-
-
 bool AuditLogWriterParallel::write(Assay *assay, int parts) {
     FILE *fp;
     int fd;