update file paths for Android

On Android, the executables are stored under /system/bin and the
data files (e.g. config file) will be stored under
/data/misc/apmanager/.  So conditionally use those paths for
Android.

Bug: 22828115
TEST=Manual test on dragonboard
TEST=Run unittest for Chrome OS

Change-Id: I7db70c93cb1b8c206742a788e356dcc195160f43
4 files changed