Implement user bind control for LDAP object changes

[ShMaunder]

Currently there is a lack of control of the user that changes LDAP attributes at LDAP library level. This includes password changes and resets. Currently the proxy user does this except when "Authenticate User" is enabled for password changes (though this option breaks password resets).

The password form injection from "LDAP - Injection" needs to be implemented into the bouncer to provide a standardized method of capturing the user's password. This subsequently will allow a bind control option to be implemented.