* fixed NPE when specified app name does not exist
* force stop package before starting, because some names may
resolve into the same package
* ensure app is launched in the order as sepcified in command
line
* fixed time recording: it should have been 'thisTime' as
reported by ActivityManager, to be consistent with previous
harness
Change-Id: I411a568580feef21821dcbe6ec15884f697af6fd
c28a062ffd