Introduce script ctrl2cgi.py

This scripts implements a similar proxy to the one already available in
soapy.py, but aiming at converting CTRl into a regular HTTP POST Request
to be handled by a CGI script in the HTTP server.

Furthermore, it includes several improvements over the soapy.py script,
such as using a token to authenticate users and capability to read some
parameters from a cfg file.

Change-Id: I7a83ecb379835e295c8cb4c27c39883783746544
diff --git a/README b/README
index 2c04047..37cd847 100644
--- a/README
+++ b/README
@@ -9,6 +9,7 @@
 There are currently following scripts in this package:
 osmotestconfig.py - test that apps start/write with example configs
 soap.py - implementation of SOAP <-> Ctrl proxy implemented on top of Twisted
+ctrl2cgi.py - implementation of CGI <-> Ctrl proxy implemented on top of Twisted
 osmo_rate_ctr2csv.py - rate counter dumper on top of osmo_ipa
 osmo_interact_vty.py - pipe stdin/stdout to a VTY session
 osmo_interact_ctrl.py - pipe stdin/stdout to a CTRL port