Fix default amqp port setting for rabbit

Two problems addressed here:

1) The default port setting for rabbit connections of 5671 assumes SSL
2) The connect method was not using the value provided by the caller

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.

Secondly, the connect method was simply ignoring any value for AMQP port
provided by the caller and insisting on 5671.

https://bugzilla.redhat.com/show_bug.cgi?id=1127954