Merge change 1738 into donut

* changes:
  add -e option to add extra commands to OTA script
tree: fe7f42ff1d14b06684fdac4c86c3bdd3ffb6e627
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh