Initialize sync-index plugin with first version

Sync-index plugin keeps the secondary index synchronized among two
Gerrit instances that share the same git repositories and Gerrit
database.

Using a new extension point in Gerrit core [1], this plugin is notified
every time a change has been indexed in or removed from the secondary
index. Then it propagates that information to the configured target
Gerrit instance. The sync-index plugin installed in the target instance
updates the corresponding secondary index accordingly.

[1] https://gerrit-review.googlesource.com/#/c/72607/

Change-Id: Id5c089cfe3263f23dd56880e47d609180aeb3edc
30 files changed
tree: 81678ba98f75a7443c091ea37ea116302b6fe8a7
  1. .buckconfig
  2. .gitignore
  3. BUCK
  4. lib/
  5. src/