Foreman » Installer

Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1362629
Description of problem:
The satellite-installer has an argument --foreman-proxy-dhcp-interface which defaults to eth0. This is a rather bold assumption to make, leading to hard-to-troubleshoot issues.
In my opinion, a better default would be to not limit dhcpd to a specific interface but rather omit that argument altogether.

Version-Release number of selected component (if applicable):
satellite-installer-6.2.0.11-1.el7sat

How reproducible:
Every time

Steps to Reproduce:
1. Set up a satellite, not using too many esoteric options
2. Scratch your head, wondering why provisioning on eth1 fail