Bz1127954 amqp default port

I've waffled on this one a bit.  Originally, I thought it would be a good idea to default to assume AMQP over SSL.  However in practice, that's proving to be the wrong choice.

When setting up AMQP to use SSL, several steps are involved including copying ssl certs from the AMQP server over to the ManageIQ appliance.  Defaulting to the SSL AMQP port assumes that the user is going to take these steps.  It's better to assume non-ssl, and then include changing the default AMQP port number
part of the steps for configuring AMQP to use SSL in the appliance.

With this change, the default port value in the AMQP event monitors and the default worker settings assume non-ssl for AMPQ.

https://bugzilla.redhat.com/show_bug.cgi?id=1127954
Can we put 5672 into a class constant somewhere so it doesn't have to be listed in 3 spots?  Is there a single class each will have easy access to?