Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Allow to configure the number of hook execution workers
  Submit: Handle potentially missing username

Change-Id: I19cc4953e64bcba429e72fe033b79f03154b41d9
tree: ae5c9a89939353fe7556ce65280161efe02ae209
  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.