oft: sort tests by name

The old ordering was based on iterating over a hashtable.
diff --git a/oft b/oft
index ec80451..c34d4e0 100755
--- a/oft
+++ b/oft
@@ -498,8 +498,8 @@
 #@todo Decide if multiple suites are ever needed
 suite = unittest.TestSuite()
 
-for (modname, (mod, tests)) in test_modules.items():
-    for (testname, test) in tests.items():
+for (modname, (mod, tests)) in sorted(test_modules.items()):
+    for (testname, test) in sorted(tests.items()):
         suite.addTest(test())
 
 # Allow platforms to import each other