Unquote url path for log_message method.

Replace %xx escapes by their single-character equivalent explicitly,
what BaseHTTPServer (Py2) or http.server (Py3) does not do,
otherwise log_message will deal with %xx escapes as %-formatting.
And will raise TypeError exception: not enough arguments for format
string.

websockify/websocket.py

@@ -35,6 +35,8 @@ try:    from io import StringIO
 except: from cStringIO import StringIO
 try:    from http.server import SimpleHTTPRequestHandler
 except: from SimpleHTTPServer import SimpleHTTPRequestHandler
+try:    from urllib.parse import unquote
+except: from urllib import unquote
 
 # python 2.6 differences
 try:    from hashlib import sha1
@@ -510,7 +512,7 @@ class WebSocketRequestHandler(SimpleHTTPRequestHandler):
             self.log_message("%s: Version %s, base64: '%s'", client_addr,
                              self.version, self.base64)
             if self.path != '/':
-                self.log_message("%s: Path: '%s'", client_addr, self.path)
+                self.log_message("%s: Path: '%s'", client_addr, unquote(self.path))
 
             if self.record:
                 # Record raw frame data as JavaScript array