Fix project load ordering to match 0.13.5 and previous.

* root project needs to be discovered FIRST in the list.
* All other rpojects come in the order they were seen.
Disable failing derived test for now.

* Disable test of derived setting which depends on itself
* Not sure we even care about supporting that feature.
Merge pull request #1333 from sbt/wip/fix-derived-setting-tests

Fixed project/derived test to pass