SOC-2014 Change users list filtering and sorting policy for both connections and people pages

Fix description: order people list result by last name, then by first name if last name is the same.
SOC-4224 [Connection] the list under search by name field display "Firstname lastname" that we cannot search with it

Fix description:
- update logic in getFullName method
- update test case
- update query to search also with user first name, last name
- don't update fullname when user renames his first name or last name
Merge commit 'ecf699ff2a20d1cc3b83c3646b3a5168e6818bed' into HEAD