Reduce sleep duration in SuspendAllDaemonThreads

Previously we unconditionally slept for 200ms which caused runtime
shutdown to take 200ms longer than required.

Reduces runtime shutdown time for "am" from ~200ms to ~10ms.

Bug: 26351700
Change-Id: I7fd0059cb3b04dba0acc4a1754e76c89ec867f85
1 file changed