Add simple_server.py as a script to make testing easier

Signed-off-by: Vladimir Diaz <vladimir.v.diaz@gmail.com>

setup.py

@@ -109,6 +109,7 @@
   packages = find_packages(exclude=['tests']),
   scripts = [
     'tuf/scripts/basic_client.py',
-    'tuf/scripts/tufcli.py'
+    'tuf/scripts/tufcli.py',
+    'tuf/scripts/simple_server.py'
   ]
 )

tuf/scripts/simple_server.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python
+
+"""
+<Program>
+  simple_server.py
+ 
+<Author>
+  Konstantin Andrianov.
+
+<Started>
+  February 15, 2012.
+  
+<Copyright>
+  See LICENSE for licensing information.
+
+<Purpose>
+  This is a basic server that was designed to be used in conjunction with 
+  test_download.py to test download.py module. 
+
+<Reference>
+  SimpleHTTPServer:
+    http://docs.python.org/library/simplehttpserver.html#module-SimpleHTTPServer
+"""
+
+# Help with Python 3 compatibility, where the print statement is a function, an
+# implicit relative import is invalid, and the '/' operator performs true
+# division.  Example:  print 'hello world' raises a 'SyntaxError' exception.
+from __future__ import print_function
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import unicode_literals
+
+import sys
+import random
+
+import six
+
+PORT = 0
+
+def _port_gen():
+  return random.randint(30000, 45000)
+
+if len(sys.argv) > 1:
+  try:
+    PORT = int(sys.argv[1])
+    if PORT < 30000 or PORT > 45000:
+      raise ValueError
+  
+  except ValueError:
+    PORT = _port_gen()
+
+else:
+  PORT = _port_gen()
+
+Handler = six.moves.SimpleHTTPServer.SimpleHTTPRequestHandler
+httpd = six.moves.socketserver.TCPServer(('', PORT), Handler)
+
+httpd.serve_forever()