Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Submit: Get the change Id from the patch set Id

Change-Id: I75d1c3aea53c580dc87c8d4a4911d8540ef9bd8f
tree: fed73f0ef6022b1e94bfe5779e0d680ff9d3b813
  1. src/
  2. .gitignore
  3. BUILD

Hooks plugin

Gerrit does not support the standard server-side git hooks in the repositories it manages.

This plugin adds support for custom hooks that can be run instead. Refer to the configuration documentation and list of supported hooks for details.