Support for RabbitMQ 3.7 on Amazon Linux 2

[michaelklishin]

See #514 and #493. It would be nice to support at least latest versions of Amazon Linux 2 (in combination with supported RabbitMQ release series).

Some initial findings:

• RabbitMQ zero dependency Erlang RPM for CentOS 7 installs and seem to be functional on AL2
• RabbitMQ CentOS 7 package seem to be functional
• There doesn't seem to be an ESL Erlang package for AL2 (they also don't have one for Fedora)

[michaelklishin]

Erlang cookbook doesn't support AL2 besides building from source. recipe[rabbitmq_erlang] is therefore going to be required. I have a passing test suite that provisions RabbitMQ 3.7 on AL2.

[michaelklishin]

@dannygueta not sure if this combination is an option for you but I will push Amazon Linux 2 support tested with RabbitMQ 3.7.13 packages shortly. Since 3.6.15 is out of support, perhaps you can run this combination? You very likely won't have to update your clients.

[dannygueta]

@michaelklishin would definably help, thanks!

[michaelklishin]

@dannygueta with a bit of attribute massaging you can also run RabbitMQ 3.6 with the tip of v5.x. See the 3.7 suite as well as 3.6 one.
Provisioning Erlang was the biggest hurdle. It's good timing that we have LWRPs and a recipe to provision team RabbitMQ's zero dependency Erlang RPM.

Oh, and only Amazon Linux 2 is supported. Let me know how it goes.

[dannygueta]

@michaelklishin did a quick test, seems to work like a charm, thanks 👍