Merge branch stable-2.12 into HEAD

* stable-2.12:
  Add sha1 for the Gerrit plugin api dependency
  Fix stable-2.12 build and tests

Change-Id: I89d4ae72bb09a0bcb1ff8a7bd3341521b3f6fff9
tree: b37978983a83eab99f86ba67444656aeb4aeb124
  1. .settings/
  2. lib/
  3. src/
  4. .buckconfig
  5. .gitignore
  6. BUCK
  7. LICENSE
  8. pom.xml
  9. VERSION