use bash functionality instead of sed to filter SAN variable
use bash functionality instead of sed to filter SAN variable

lukas2511/letsencrypt.sh,erorus/letsencrypt.sh,dennisschuerholz/dehydrated,Vitexus/dehydrated,erdgeist/letsencrypt.sh,erdgeist/letsencrypt.sh,lukas2511/dehydrated,Rayne/letsencrypt.sh,ahnooie/dehydrated