added backend support for VPN information setting
added backend support for VPN information setting

iclab/centinel,iclab/centinel,lianke123321/centinel,Ashish1805/centinel,rpanah/centinel,rpanah/centinel,iclab/centinel,rpanah/centinel,JASONews/centinel,lianke123321/centinel,lianke123321/centinel,ben-jones/centinel