add util to pull down a cert and its fingerprint
add util to pull down a cert and its fingerprint

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