Move multi-site plugin to the standard build

The multi-site plugin now belongs to gerrit-review.googlesource.com
and thus can be built using the standard template.

Change-Id: Icc8f9abbf23f310371e4a0eae64a629fb15f8d6a
2 files changed
tree: d9288ac95e00de65fe2561ba6f2ec3001f5be051
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore