lower ECONNRESET level

src/event/ngx_event_connect.c

diff --git a/src/event/ngx_event_connect.c b/src/event/ngx_event_connect.c
index b5e1a87..839bb6c 100644
--- a/src/event/ngx_event_connect.c
+++ b/src/event/ngx_event_connect.c
@@ -155,6 +155,7 @@
                  */
                 || err == NGX_EAGAIN
 #endif
+                || err == NGX_ECONNRESET
                 || err == NGX_ENETDOWN
                 || err == NGX_ENETUNREACH
                 || err == NGX_EHOSTDOWN