Support audit events rendered as JSON string

Allow to configure a different rendering for audit events
by specifying the renderer in gerrit.config.

Example:

[plugins "audit-sl4j"]
   renderer = JSON

Change-Id: Iff734fc5429f15913df66779570d91dc51a73a32
12 files changed
tree: a9cc50cb95366b637d9bbb709b58dfdf0b98eaf1
  1. src/
  2. .gitignore
  3. BUILD
  4. LICENSE