Avoid polluting main Jenkins log with tons of messages about normally completed builds.
Especially noisy for Maven projects with many modules:
2014-…+0000 [id=…]	INFO	c.s.h.p.g.t.g.ToGerritRunListener#onCompleted: Completed. Build: folder/job/groupId:artifactId #99 Cause: null
Set optional flag to GerritTriggerBuildChooser extension.

Git plugin is optional, So any loading error should not be logged.

Fix for JENKINS-22813: Warning when clean install and restart 
https://issues.jenkins-ci.org/browse/JENKINS-22813
Reduce level from info to debug

In constructor of DependencyQueueTaskDispatcher and
ReplicationQueueTaskDispatcher.

Fix for JENKINS-22814: Some infomations are logged from constructor on
startup 
https://issues.jenkins-ci.org/browse/JENKINS-22814
Get gerrit events from RabbitMQ as message queue service

This patch adds implementation of MessageQueueListener extension in
RabbitMQ Consumer Plugin.

https://wiki.jenkins-ci.org/display/JENKINS/RabbitMQ+Consumer+Plugin

Using this feature, we can trigger job by gerrit event in message queue.
Merge pull request #147 from jglick/ToGerritRunListener-please-be-quiet

Make ToGerritRunListener quieter
Merge pull request #148 from rinrinne/optional-dependency

Set optional flag to GerritTriggerBuildChooser extension
Merge pull request #149 from rinrinne/log-on-startup

Reduce level from info to debug
Merge pull request #151 from rinrinne/rabbitmq

Get gerrit events from RabbitMQ as message queue service