Bug fix in Alarm where it was not getting called correctly if the

new timeout was set that was smaller than the previously set timeout

> Using uptimeMillis in Alarm to avoid errors due to system time
changes
> Adding an extra check in Wait in case Thread.sleep eats up
all the timeout

Change-Id: Id1fac5e8fdb81a0c3c7a6a5e50586b2a2f180d06