test: update bucket notification integration test with http server

Add test cases to check notification is received by http server. For
this a sample http server https://github.com/thotz/pythonwebserver is
used.

Signed-off-by: Jiffin Tony Thottan <thottanjiffin@gmail.com>

tests/scripts/pythonwebserver/server.py

@@ -0,0 +1,54 @@
+'''
+Copyright 2022 The Rook Authors. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+'''
+#!/usr/bin/env python3
+"""
+Very simple HTTP server in python for logging requests
+Usage::
+    ./server.py [<port>]
+"""
+from http.server import BaseHTTPRequestHandler, HTTPServer
+import logging
+
+class S(BaseHTTPRequestHandler):
+    def _set_response(self):
+        self.send_response(200)
+        self.send_header('Content-type', 'text/html')
+        self.end_headers()
+
+    def do_POST(self):
+        content_length = int(self.headers['Content-Length']) # <--- Gets the size of data
+        post_data = self.rfile.read(content_length) # <--- Gets the data itself
+        logging.info("POST request\nBody:\n%s\n", post_data.decode('utf-8'))
+
+def run(server_class=HTTPServer, handler_class=S, port=8080):
+    logging.basicConfig(level=logging.INFO)
+    server_address = ('', port)
+    httpd = server_class(server_address, handler_class)
+    logging.info('Starting httpd...\n')
+    try:
+        httpd.serve_forever()
+    except KeyboardInterrupt:
+        pass
+    httpd.server_close()
+    logging.info('Stopping httpd...\n')
+
+if __name__ == '__main__':
+    from sys import argv
+
+    if len(argv) == 2:
+        run(port=int(argv[1]))
+    else:
+        run()