MINOR: tests: add a python wrapper to test inherited fd

tests/test-inherited-fd.py

@@ -0,0 +1,23 @@
+#!/usr/bin/python
+"""
+Python wrapper example to test the fd@ function,
+You have to bind on fd@${NEWFD} in your haproxy configuration
+
+The configuration parsing should still work upon a reload with the master-worker
+mode.
+
+"""
+
+import socket, subprocess, fcntl
+
+s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+flags = fcntl.fcntl(s.fileno(), fcntl.F_GETFD)
+flags &= ~fcntl.FD_CLOEXEC
+fcntl.fcntl(s.fileno(), fcntl.F_SETFD, flags)
+
+s.bind((socket.gethostname(), 5555))
+s.listen(1)
+FD = s.fileno()
+
+subprocess.Popen('NEWFD={} ./haproxy -W -f haproxy.cfg'.format(FD), shell=True, close_fds=False)