Framework: First cut at refactoring Nightly tests to new 3-tier CDash

Created by: william76

@trilinos/framework

Sorting tests that are currently reporting to the Nightly CDash track into three categories:

1. Clean - highest priority builds. These are expected to stay "green" and there will be a significant push to developers to fix bugs when a build here goes "red".
2. Nightly - second tier. Still important, but there isn't the pressure and expected turn-around time on fixes when something goes red.
3. Specialized - third tier. More specific builds that probably matter to a smaller group of developers.

This relates to issues #1182 (closed) #1268 (closed) #702 (closed)