Changing root passwords

==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP):
- Linux/BSD distribution name and version: Centos 6.5
- Related log if you're reporting an issue:
====

Hi Zhang,

I want to change my passwords for MySQL(root) and LDAP (cn=Manager). 

iRedMail places passwords in a lot of locations...once I change these, can you advise me which files would also need to be updated with the new passwords.

Thanks