Added simple socket bind check for populated ports if psutil is not available
Added simple socket bind check for populated ports if psutil is not available

stweil/letsencrypt,jsha/letsencrypt,letsencrypt/letsencrypt,bsmr-misc-forks/letsencrypt,jsha/letsencrypt,stweil/letsencrypt,lmcro/letsencrypt,jtl999/certbot,letsencrypt/letsencrypt,lmcro/letsencrypt,bsmr-misc-forks/letsencrypt,jtl999/certbot