Each CurrentUserTracker has one receiver per one object.
This could cause unnecessary transaction as Tracker counts
increases. The idea of redcuing receiver is creating
one static receiver for CurrentUserTracker and share it
with all object.
Test: Check if Quicksetting order is changed properly
after switching user.
Change-Id: I8404829826391f8b315b42bbd0f50e77b783eeab
e9556a89db