[Building Sakai] KNL-696 New optional UDP interface DisplaySortAdvisorUDP

[David Horwitz]

Hi All,

While going through Jira's I came across this Jira and patch from Nuno 
Fernandez:

https://jira.sakaiproject.org/browse/KNL-696

it concerns the need to be able to override the default sort names in 
certain locales (i.e. in areas where surname, first name) might not be 
appropriate. I have commited Nuno's suggestion with a slight 
modification: instead of  extending the DisplaySortAdvisorUDP I have 
created a new optional interface DisplaySortAdvisorUDP. So if you wish 
to override the sort name behavior simply add this interface to your 
provider and implement its single method.

Regards

David