Stop tracking user specific uid cpu time on user stop

Telling kernel module uid_cputime to stop accounting time for uids
belonging to a stopped user. Upon user remove, removing uid states for
those uids.

Test: adb shell am instrument -e class \
com.android.internal.os.BatteryStatsUserLifecycleTests -w \
com.android.frameworks.coretests/android.support.test.runner.AndroidJUnitRunner

adb shell am instrument -e class android.util.SparseLongArrayTest -w \
com.android.frameworks.coretests/android.support.test.runner.AndroidJUnitRunner

Bug: 62390461
Change-Id: Ibe07778465e3d2c13679e4d88d32f7b92fa959d9