Add Registry.close() function to properly clean up resources

re6st/registry.py

@@ -155,6 +155,11 @@ class RegistryServer:
         else:
             self.newHMAC(0)
 
+    def close(self):
+        self.sock.close()
+        self.db.close()
+        self.ctl.close()
+
     def getConfig(self, name, *default):
         r, = next(self.db.execute(
             "SELECT value FROM config WHERE name=?", (name,)), default)

re6st/tests/test_unit/test_registry.py

@@ -70,6 +70,7 @@ class TestRegistryServer(unittest.TestCase):
 
     @classmethod
     def tearDownClass(cls):
+        cls.server.close()
         # remove database
         for file in [cls.config.db, cls.config.ca, cls.config.key]:
             try: