[rabbitmq-compat] use sensu-transport 2.1.0 for compat fix
[rabbitmq-compat] rescue em connection errors on reconnect
[rabbitmq-compat] sensu-transport 2.4.0, delay initial master election
[rabbitmq-compat] increased master election test delay
Merge pull request #814 from portertech/hotfix/rabbitmq-compat

Use sensu-transport 2.4.0 for compatibility fix