Add in the ability to configure IP restrictions for the UAA and Login Server

Add in the ability to configure IP restrictions for the UAA and Login Server HTTP ports.

These have til date been preconfigured with a set of private ranges
https://www.pivotaltracker.com/story/show/81048758
[#81048758]
We initially had this, but decided against it. Even with a default in place, we need the ternary operator in case someone accidentally merges in a null value from a template. So rather than specifying the default in two places, it is just in one place.