gh-145548: Log vsock CID in test.pythoninfo

Author: vstinner

Lib/test/pythoninfo.py

@@ -751,6 +751,10 @@ def collect_test_socket(info_add):
                   if name.startswith('HAVE_')]
     copy_attributes(info_add, test_socket, 'test_socket.%s', attributes)
 
+    # Get IOCTL_VM_SOCKETS_GET_LOCAL_CID of /dev/vsock
+    cid = test_socket.get_cid()
+    info_add('test_socket.get_cid', cid)
+
 
 def collect_support(info_add):
     try: