Move status loader into the git package

- Loading status belongs to git domain so it makes more sense for it to
  be in git package.
- It also makes the `list` file simpler.
- Because status loader is now part of the RepoFinder, the ugly Repo interface is no longer necessary.

pkg/git/finder_test.go

@@ -38,10 +38,10 @@ func TestFinder(t *testing.T) {
 			root := test.reposMaker(t)
 
 			finder := NewRepoFinder(root)
-			paths, _ := finder.Find()
+			finder.Find()
 
-			if len(paths) != test.want {
-				t.Errorf("expected %d; got %d", test.want, len(paths))
+			if len(finder.repos) != test.want {
+				t.Errorf("expected %d; got %d", test.want, len(finder.repos))
 			}
 		})
 	}