title: install mysql 5.7 without root password
body: <p>trying to install mysql 5.7 i get the prompt for a root password. 
  after pressing enter i assume that the password for the root user will just be blank (null?)</p>
  
  <p>if i try to connect to the server with <code>mysql -u root</code> the connection can't be established due to wrong authentication. if i add the <code>-p</code> parameter to get the prompt and leaving that empty will also result in bad authentication. </p>
  
  <p>i'm not sure if can i completely remove the root password for mysql.</p>