Improvements to the rabbitmq integration

Fix #682 , Fix #644
Change aggregation key for the rabbitmq events
Fix in rabbitmq integration according to alq's review
Fix haproxy fake hosts issue, first part of #617
Add more metrics to the haproxy integration and add the possibility to collect aggregates only

Fix #688 Fix #689
Fix haproxy test according to new behaviour
Merge branch 'haproxy_rabbitmq_3_10_0'
Make haproxy collect aggregates only by default