contrib: Add a python script to start sysmobts-remote and dump docs

This starts sysmobts-remote and dumps the documentation about the
VTY to the doc/ directory.

$ ./contrib/dump_docs.py
this writes doc/vty_reference.xml

contrib/dump_docs.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+
+"""
+Start the process and dump the documentation to the doc dir
+"""
+
+import socket, subprocess, time,os
+
+env = os.environ
+env['L1FWD_BTS_HOST'] = '127.0.0.1'
+
+bts_proc = subprocess.Popen(["./src/osmo-bts-sysmo/sysmobts-remote",
+		"-c", "./doc/examples/osmo-bts.cfg"], env = env,
+		stdin=None, stdout=None)
+time.sleep(1)
+
+try:
+	sck = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+	sck.setblocking(1)
+	sck.connect(("localhost", 4241))
+	sck.recv(4096)
+
+	# Now send the command
+	sck.send("show online-help\r")
+	xml = ""
+	while True:
+		data = sck.recv(4096)
+		xml = "%s%s" % (xml, data)
+		if data.endswith('\r\nOsmoBTS> '):
+			break
+
+	# Now write everything until the end to the file
+	out = open('doc/vty_reference.xml', 'w')
+	out.write(xml[18:-11])
+	out.close()
+finally:
+	# Clean-up
+	bts_proc.kill()
+	bts_proc.wait()
+