Correct the wakelock count while attributing for a request

Correct the wakelock count when a request response is received and
corresponding wakelock count is decremented.

Account for wakelock timeout during which wakelock is released and
all corresponding clients are released from the clientTracker.

Test: Through logs confirmed that the wakelock decrement is happening
correctly

BUG=31798717

Change-Id: Iec6ba6d8060620915c704b5086d18a776073b10c