added error output of openssl signature errors
added error output of openssl signature errors

diafygi/acme-tiny,corokada/acme-tiny,corokada/acme-tiny,appuio/acme-tiny,oittaa/acme-tiny,ushuz/letsencrypt,appuio/acme-tiny,oittaa/acme-tiny,bwurst/acme-tiny,appuio/acme-tiny,Trim/acme-dns-tiny,rspeed/acme-simple