Add support for random available port number determination

essentials/services/ConnectionService.py

@@ -0,0 +1,14 @@
+import socket
+
+
+class ConnectionService:
+
+    @staticmethod
+    def get_random_available_port_number():
+
+        socket_instance = socket.socket()
+        socket_instance.bind(('', 0))
+        port_number = socket_instance.getsockname()[1]
+        socket_instance.close()
+
+        return port_number