Do not create oat directory for an app in ASEC container

Currently installation fails, if an app is located on SD card (inside ASEC).
If an app is located inside ASEC, dexopt output should go to
/data/dalvik-cache. dexopt also needs to be performed at a later stage,
because the name of the oat file contains the absolute path to the dex file.

Bug: 20452651
Change-Id: I4432ca7a0b0e88b705705acf42e5cae78cadf729