Fix:
===
Add "REPLICA" as an alias for "SLAVE". All commands which use "SLAVE" keyword
can be used with new alias "REPLICA".
List of commands:
On Master:
=========
SHOW REPLICA HOSTS <--> SHOW SLAVE HOSTS
Privilege "SLAVE" <--> "REPLICA"
On Slave:
=========
START SLAVE <--> START REPLICA
START ALL SLAVES <--> START ALL REPLICAS
START SLAVE UNTIL <--> START REPLICA UNTIL
STOP SLAVE <--> STOP REPLICA
STOP ALL SLAVES <--> STOP ALL REPLICAS
RESET SLAVE <--> RESET REPLICA
RESET SLAVE ALL <--> RESET REPLICA ALL
SLAVE_POS <--> REPLICA_POS
