Merge change 5017 into donut

* changes:
  Don't install afar and dexpreopt-wrapper on system while building tests.
tree: 0fca6eb5ce4c47b3b358f616d7cacd6cdf9bde6a
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh