[INTERNAL] user nickname is now part of user list synchronization

Change-Id: Ib9574c5d888801d6536a43cb33abf872c2bce1a3
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1614
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>