Add new datas for GLPIInventory ( 'list of admins' , 'external_ip' , ... )

I will add new datas, during the Inventory task scheduled by GLPIAgent, 

* list_admins:         the list of local admins (in a Windows environment)
  Why ?                 identify, in a parc, the rogue admins

* external_ip:          the external ip of the host

    Why ?             identify if its location , Is it in telework or on a specific site