add env/1, merge_sockopts
add env/1, merge_sockopts

codertrack/emqttd,sunilkumartc/ermqtt,sunilkumartc/ermqtt,sunilkumartc/ermqtt,yangchaogit/emqttd,Inner-room/emqttd,wwezhuimeng/emqtt,janshahid/jmq,wwezhuimeng/emqtt,guidao/emqttd,sureddy/emqttd,shaominghaoo/emqttd,jfjalburquerque/emqttd,joaohf/emqttd,yocome/emqttd,tempbottle/emqttd,fengshao0907/emqttd,kimiscircle/emqttd,neviim/emqttd,kimiscircle/emqttd,yanyanqin/emqttd,gxbllm/emqttd,lianghaivv/emqttd,santuoshi/emqttd,AcmHacker/emqttd,mickelfeng/emqttd,fsxchen/emqttd,kimiscircle/emqttd,wwezhuimeng/emqtt