Bug: setup-util is noisey

[balupton]

Since the recent changes, that uses --shapeshifter for the setup-util installers, as it cycles through the installers, it gets quite noisey due to delays in screen buffers. Before using --shapeshifter this noise was not noticeable before, as echo-revolving-door's clearing line approach was speedy enough that it wasn't noticeable.

The solution to this will be to detect installer applicability before the entire process of invoking and clearing for an installer.

This is a simple change, but will require a sizeable but simple refactor inside setup-util.