LDAP: get user photo from LDAP and set it as avatar if available
Enable user backends to provide avatar images
LDAP: user proxy must support canChangeAvatar too
Avatar: accept OC_Image as  in setParameter
LDAP: last avatar lookup must be stored per user. Someone had a blackout, eh?
LDAP: proxy: configurable return to determine when to try the next LDAP server and when to return (multi server setup)
LDAP:  username2dn should only return DNs that belong to the current LDAP server. Might be not perfect. Easy perfect solution would increase communication with LDAP server. Let's see if it is good enough
Make sure Avatar is set from LDAP upon first login, not later, but also not before due to missing user folder
Merge pull request #6058 from owncloud/ldap2avatar

Set Avatar for LDAP users automatically (if a picture is available)