Last few fixes to get tester self-hosted

sys.version_info (just as tuple, not as "version_info" object)
Change test that depends on what fds are open
Fix threading bug in tester

The tester now runs in self-hosted mode!  Try
$ make check SELF_HOST=1

src/runtime/builtin_modules/sys.cpp

@@ -264,6 +264,10 @@ void setupSys() {
 
     sys_module->giveAttr("version", boxString(generateVersionString()));
     sys_module->giveAttr("hexversion", boxInt(PY_VERSION_HEX));
+    // TODO: this should be a "sys.version_info" object, not just a tuple (ie can access fields by name)
+    sys_module->giveAttr("version_info",
+                         new BoxedTuple({ boxInt(PYTHON_VERSION_MAJOR), boxInt(PYTHON_VERSION_MINOR),
+                                          boxInt(PYTHON_VERSION_MICRO), boxStrConstant("beta"), boxInt(0) }));
 
     sys_module->giveAttr("maxint", boxInt(PYSTON_INT_MAX));
 

test/tests/class_noctor.py

-# skip-if: sys.version_info.micro < 4
+# skip-if: sys.version_info < (2, 7, 4)
 # - Error message changed in 2.7.4
 
 # Regression test:

test/tests/object_new_arguments.py

-# skip-if: sys.version_info.micro < 4
+# skip-if: sys.version_info < (2, 7, 4)
 # - Error message changed in 2.7.4
 
 # object.__new__ doesn't complain if __init__ is overridden:

test/tests/select_test.py

@@ -21,7 +21,7 @@ gc.collect()
 p.unregister(f)
 p.register(f)
 try:
-    print p.poll(10)
+    print len(p.poll(10))
 finally:
     f.close()
 gc.collect()

tools/tester.py

@@ -336,8 +336,8 @@ def worker_thread():
         except:
             import traceback
             # traceback.print_exc()
-            results[job[0]] = None
             quit[job[0]] = job[0] + ':\n' + traceback.format_exc()
+            results[job[0]] = None
             with cv:
                 cv.notifyAll()
             # os._exit(-1)