puavo-update-certificate: remove useless require
puavo-update-certificate: use default net-https library
puavo-update-certificate: write certificate file without PuavoEtc
puavo-update-certificate: better variable name
puavo-update-certificate: get hostname by Socket
puavo-update-certificate: detect Ubuntu release
puavo-update-certificate: Use PuavoEtc only if release is not lucid
puavo-update-certificate: get puavo server by dns with lucid
puavo-update-certificate: fix error class
puavo-update-certificate: human readable error message