add posixAccount to back-sql definition

[DavidHornung <hornuda@googlemail.com>]

Hello,

up to now i used inetOrgPerson from the docs to auth my users via 
LDAP/back-sql.
but in inetOrgPerson isnt a uid defined so the Object Class posixAccount 
would fit better.
I created a table which represents the posixAccount - minimal I need uid 
and password.
the entity integer refers to id's of table persons with mobliePhone, 
mail, etc.

CREATE TABLE net_accounts
(
  id serial NOT NULL,
  entity integer NOT NULL,
  password character varying NOT NULL,
  uid character varying NOT NULL,
  CONSTRAINT "net_accounts_pkey" PRIMARY KEY (id , uid )
)

I plan to use this posixAccount to auth with Mailserver, Intranet and 
all other services ...

How to modify the example in the docs to do this ?

Thank you!

David