Add stable-2.15 for rabbitmq plugin

There is a stable-2.15 branch that is currently not supported
in gerritforge:
  https://gerrit.googlesource.com/plugins/rabbitmq/+/stable-2.15

Change-Id: I754c7718d26b5ed9c6c7e7b5bda396d3e8b34292
1 file changed
tree: af4db7432b23713aafc0e1d42b50d5060dc7d6a4
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore