Merge change 5929 into donut

* changes:
  Add the JNI library of CertTool for handling certificates.
tree: 05f85565e233cc6288f97b64c20858a592b09a7d
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh