Updated RabbitMQ version to one that worked for me and added a tip ab…

[martinwolst]

…out the RabbitMQ-Erlang version issues. This is my first pull request to Galaxy training!

[hexylena]

We can accept this for now (welcome, we're glad to have you! thanks for the fab first contributino!)

but we're hopeful to replace this soon with the RabbitMQ role of UseGalaxy.eu (@mira-miracoli if you have time/energy to show us how to do it with role?)

see usegalaxy-eu/ansible-rabbitmq#1 for more details

[mira-miracoli]

Sure, I will put it on my to-do list ;)

[hexylena]

Danke!! 💙

[mira-miracoli]

This role https://galaxy.ansible.com/usegalaxy_eu/rabbitmq is deprecated, We should delete it or mark it in GitHub, too.

Currently we are only maintaining this role.
It runs in docker, therefore it should have no dependency issues. It is the role we are also using in our infrastructure-playbook
It has a playbook example, which I did not test recently, but it should work.