Rename AD PC on Zentyal
First, rename the PC the normal way, providing the AD admin credentials. After that, update the DB on the Zentyal server
root@ad:~# ldbrename -H ldap://127.0.0.1 -U administrator 'CN=OLD-NAME,CN=Computers,DC=example,DC=com' 'CN=NEW-NAME,CN=Computers,DC=example,DC=com' root@ad:~# zs samba restart