title: mysql DB in replication but users created on master are not replicating on slave server
body: <p>In master-slave replication we are replicating few DBs on slave server with mysql DB.
  I created an user on master, unfortunately it's not replicated on slave server.</p>
  
  <p>Replicate_Do_DB: app1,app2,mysql</p>
  
  <p>User creation commands:</p>
  
  <pre><code>GRANT SELECT on *.* to 'user1'@'localhost' identified by 'user1';
  
  GRANT SELECT on *.* to 'user1'@'%' identified by 'user1';
  
  GRANT SELECT on *.* to 'user1'@'10.10.10.10' identified by 'user1';
  </code></pre>
  
  <p>User account successfully created on master but not replicated on slave. </p>
  
  <p>Why this is happening if mysql db is in replication? </p>