Merge branch 'bugfix/remove_fast_reconnect' into 'release/v2.2.x'

fix(lwip): remove fast reconnect when ip lost

See merge request sdk/ESP8266_NONOS_SDK!133

Author: xcguang

VERSION

@@ -18,5 +18,5 @@ phy:
 
 gitlab:
     driver      :   68fc7b06
-    lwip        :   863c3eea
+    lwip        :   d481a1f7
     mbedtls     :   e4dace14

lib/liblwip.a

@@ -383,7 +383,7 @@ dhcp_fine_tmr()
     /* only act on DHCP configured interfaces */
     if (netif->dhcp != NULL) {
       /*add DHCP retries processing by LiuHan*/
-      if (DHCP_MAXRTX != 0) {
+      if (DHCP_MAXRTX != 0 && netif->dhcp->state != DHCP_RENEWING) {
     	  if (netif->dhcp->tries >= DHCP_MAXRTX){
 			  os_printf("DHCP timeout\n");
 			  if (netif->dhcp_event != NULL)