Use with instead of direct call to exit

re6st/tests/test_end2end/test_registry_client.py

@@ -42,7 +42,8 @@ class TestRegistryClientInteract(unittest.TestCase):
 
     def tearDown(self):
         self.server.proc.terminate()
-        self.server.proc.__exit__()
+        with self.server.proc:
+            pass
 
     def test_1_main(self):
         """ a client interact a server, no re6stnet node test basic function"""

re6st/tests/test_network/re6st_wrap.py

@@ -136,7 +136,8 @@ class Re6stRegistry:
         try:
             logging.debug("teminate process %s", self.proc.pid)
             self.proc.destroy()
-            self.proc.__exit__()
+            with self.proc:
+                pass
         except:
             pass
 
@@ -263,7 +264,8 @@ class Re6stNode:
         """stop running re6stnet process"""
         logging.debug("%s teminate process %s", self.name, self.proc.pid)
         self.proc.destroy()
-        self.proc.__exit__()
+        with self.proc:
+            pass
 
     def __del__(self):
         """teminate process and rm temp dir"""