Move framework test-runner unit tests to be closer to their source.

Move the test-runner source into a separate src folder to accommodate the test
move.

test-runner/junit/runner/Version.java

@@ -1,14 +0,0 @@
-package junit.runner;
-
-/**
- * This class defines the current version of JUnit
- */
-public class Version {
-	private Version() {
-		// don't instantiate
-	}
-
-	public static String id() {
-		return "3.8.1";
-	}
-}