Modify existing load scripts for a better load testing

The current scripts that we got look over-complicated and don't provide all necessary features that we need.

1. We have multiple scripts that all do almost the same. Why can't we have just one script with parameters.
2. We need to support at least the following parameters:

• type of requests (including random)
• delay between requests
• flag whether to wait for reply before sending the next request
• number of messages per thread
• number of threads