chore: remove contrib/ directory

It only contained proxy
that some users ran in Termux
to look at IMAP traffic.

The same can be achieved with `socat`, e.g.:
  socat -v TCP-LISTEN:9999,bind=127.0.0.1 OPENSSL:nine.testrun.org:993

contrib/proxy.py

@@ -1,80 +0,0 @@
-#!/usr/bin/env python3
-# Examples:
-#
-# Original server that doesn't use SSL:
-# ./proxy.py 8080 imap.nauta.cu 143
-# ./proxy.py 8081 smtp.nauta.cu 25
-#
-# Original server that uses SSL:
-# ./proxy.py 8080 testrun.org 993 --ssl
-# ./proxy.py 8081 testrun.org 465 --ssl
-
-from datetime import datetime
-import argparse
-import selectors
-import ssl
-import socket
-import socketserver
-
-
-class Proxy(socketserver.ThreadingTCPServer):
-    allow_reuse_address = True
-
-    def __init__(self, proxy_host, proxy_port, real_host, real_port, use_ssl):
-        self.real_host = real_host
-        self.real_port = real_port
-        self.use_ssl = use_ssl
-        super().__init__((proxy_host, proxy_port), RequestHandler)
-
-
-class RequestHandler(socketserver.BaseRequestHandler):
-
-    def handle(self):
-        print('{} - {} CONNECTED.'.format(datetime.now(), self.client_address))
-
-        total = 0
-        real_server = (self.server.real_host, self.server.real_port)
-        with socket.create_connection(real_server) as sock:
-            if self.server.use_ssl:
-                context = ssl.create_default_context()
-                sock = context.wrap_socket(
-                    sock, server_hostname=real_server[0])
-
-            forward = {self.request: sock, sock: self.request}
-
-            sel = selectors.DefaultSelector()
-            sel.register(self.request, selectors.EVENT_READ,
-                         self.client_address)
-            sel.register(sock, selectors.EVENT_READ, real_server)
-
-            active = True
-            while active:
-                events = sel.select()
-                for key, mask in events:
-                    print('\n{} - {} wrote:'.format(datetime.now(), key.data))
-                    data = key.fileobj.recv(1024)
-                    received = len(data)
-                    total += received
-                    print(data)
-                    print('{} Bytes\nTotal: {} Bytes'.format(received, total))
-                    if data:
-                        forward[key.fileobj].sendall(data)
-                    else:
-                        print('\nCLOSING CONNECTION.\n\n')
-                        forward[key.fileobj].close()
-                        key.fileobj.close()
-                        active = False
-
-
-if __name__ == '__main__':
-    p = argparse.ArgumentParser(description='Simple Python Proxy')
-    p.add_argument(
-        "proxy_port", help="the port where the proxy will listen", type=int)
-    p.add_argument('host', help="the real host")
-    p.add_argument('port', help="the port of the real host", type=int)
-    p.add_argument("--ssl", help="use ssl to connect to the real host",
-                   action="store_true")
-    args = p.parse_args()
-
-    with Proxy('', args.proxy_port, args.host, args.port, args.ssl) as proxy:
-        proxy.serve_forever()