This change is to start Mountservice before starting performBootDexOpt, as in one case, in performBootDexOpt when system upgrade happens, StorageManager will be started to get the low threshold of DataDir. But, at this point, as Mountservice is still not up, StorageManager will end up having a null object of Mountservice. Change-Id: If2b5e1b58e7d2a72c6313f196e98a68738295ec6