Allow Erlang version on EL8 to be pinned, and by default use < 25 #311
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Install on EL8 started to fail on RabbitMQ install. Problems reported "please re-compile this module with an Erlang/OTP 25 compiler"
Erlang 25 has been pushed to the RabbitMQ erlang repository, but according to https://www.rabbitmq.com/which-erlang.html erlang 25 support is preview.
Update so that erlang version can be specified, and make the default value 24* so do not pick up 25.
Partially resolves: #311