remove all current uploads from shared cache in case of quit

ngx_http_uploadprogress_module.c

                        "uploadprogress clean: scanning %08XD (req done %ui) timeout at %T",
                        node->key, up->done, up->timeout);
 
-        if (up->done && up->timeout < now) {
+        if ( (up->done && up->timeout < now) || (ngx_quit || ngx_terminate || ngx_exiting) ) {
             up->next->prev = up->prev;
             up->prev->next = up->next;