Merge branch 'bugfix/fix_dhcp_renew_fail' into 'master'

fix(lw-ip): fix dhcp renew fail due to dhcp renew packet dropped by wifi ERR_MEM

See merge request sdk/ESP8266_RTOS_SDK!1531
This commit is contained in:
Dong Heng
2020-09-18 15:16:13 +08:00