Parameterize IP addresses in manual tests

tests/manual-tests/half-open-close-client/client.py

@@ -1,8 +1,11 @@
 import socket
 import time
+import sys
 
 with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
-    s.connect(('116.203.215.166', 1337))
+    ip, port = sys.argv[1].split(':', 1)
+    port = int(port)
+    s.connect((ip, port))
     s.sendall('I am closing the write end, but I can still receive data'.encode())
     s.shutdown(socket.SHUT_WR)
     while True:

tests/manual-tests/half-open-close-server/client.py

@@ -1,8 +1,11 @@
 import socket
+import sys
 import time
 
 with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
-    s.connect(('116.203.215.166', 1337))
+    ip, port = sys.argv[1].split(':', 1)
+    port = int(port)
+    s.connect((ip, port))
     while True:
         data = s.recv(1024)
         if not data: