Fix mysql 8 authentication plugin (#979)
Fix mysql 8 authentication plugin (#979)

The previous implementation just was echoing the string to stdout,
this ensures that it reaches /etc/mysql/conf.d/mysql.cnf

Also while testing this i found that this requires a restart before
creating the users.
laravel/homestead,svpernova09/homestead,laravel/homestead,laravel/homestead,svpernova09/homestead,svpernova09/homestead