Description of problem:

When deploying Satellite in environments with existing DNS infrastructure, the user wishes to easily configure Satellite to be able to add/remove DNS entries on their DNS servers. 

Example usage:

The user has a server, dnsbox.example.com, which hosts two DNS zones, example.com &
hosts.example.com. Both are dynamic zones which have the appropriate
RNDC keys setup.

A Satellite, which the user is planning to deploy as satellite.hosts.example.com, which will provision additional hosts in
the hosts.example.com domain.

The user doesn't wish to run a DNS server locally on the Satellite, as there is existing infrastructure that provides DNS. 


Currently the user is required to manually configure /etc/foreman-proxy/settings.yml to achieve this configuration.  This should be optimally exposed via the installer, so that the end-user can have a working configuration 'out of box'


Version-Release number of selected component (if applicable):
katello-installer-0.0.53-1.el6sat.noarch


Additional info:

As a point of comparison, upstream Foreman supports the following install options:

    --foreman-proxy-dns-managed   DNS is managed by Foreman proxy (default: true)
    --foreman-proxy-dns-server    Address of DNS server to manage (default: "127.0.0.1")


This RFE requests similar functionality added to katello-installer.