title: mysql 5.7 log-slow-queries error
body: <p>I'm trying to enable Slow Query Logging on mysql 5.7 and getting this error:</p>
  
  <p>2016-04-27T14:55:51.934612Z 0 [ERROR] unknown variable 'log-slow-queries=/var/log/mysql-query.log'</p>
  
  <p>2016-04-27T14:55:51.934639Z 0 [ERROR] Aborting</p>
  
  <p>In my /etc/my.cnf file I have "log-slow-queries=/var/log/mysql-query.log" defined, but I'm going to assume that in 5.7 that is invalid. What is the correct my.cnf settings to enable query logging?
  Thanks,</p>