when user doesn't have root sudo, install should print the commands to run with root privileges

Root privilege with sudo is common on ubuntu but it's not the only linux distribution !

"Normal" users without sudo are common, with admin task done with a lot of others way (root ssh access, root password, other admin user…).
In that case, a `mkcert -install` fails (it loops on asking the sudo password that doesn't exists), it should ask if user wants to try another sudo pass or give the root password or print the commands that needs to be run by root.