EPP: option to disclose contact data

[vohmar]

Some registrants have requested an option to publish their contact data on public whois.

For this we will implement EPP disclose elements: https://tools.ietf.org/html/rfc5733#section-2.9

• Admin must be able to configure server default policy in the admin interface
• Admin must be able to configure to what extent it is possible for client to override the default policy (which data elements)

Usecase:
by default EIS discloses contacts name, ident code and country for business contacts only. The email address in only published on EIS's website (IP based filter)

user wants to publish his/hers email address and phone number. Valid EPP for this purpose:

   <contact:disclose flag="1">
    <contact:email/>
    <contact:voice/>
   </contact:disclose>