Fix unit tests

tests/test_coding/test_resources.py

@@ -35,3 +35,8 @@ class TestResources(unittest.TestCase):
         ret = do_call()     # type: Future
         cp.release_connection(conns.pop())
         ret.result(timeout=5)
+
+        while conns:
+            cp.release_connection(conns.pop())
+
+        del cp

tests/test_coding/test_rethrow.py

@@ -66,7 +66,6 @@ class TestStuff(unittest.TestCase):
         else:
             self.fail('KeyError not raised')
 
-    @unittest.skipIf(sys.implementation.name == 'cpython', 'Running on CPython')
     def test_log_exceptions(self):
         a = 5