adding auto detect to the NIC and allowing user to change the requierd RPMs

[simonoded]

1. add auto detect for default NIC in addition to localhost
2. change the rpm list to var

[gclough]

I like the idea of the package lists instead of hardcoding them, bravo.

I'm not sure if we want to deploy a standard configuration that listens on the interface. We could include * in here to make sure it's available everywhere, but I think the expectation is that people will include that in their inventory if they wanted it:

postgresql_listen_addresses: "*"

I think the intent was to deploy in a secure way and only listen on localhost by default, and leave the opening up to be done as needed.

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