Implemented SqlReplay.Batch utility.

[KonsN]

Purpose: allow running multiple replays sequentially without manual start in the following use cases:

• events collection span extended time period
  and
• event collection session resulted in multiple event files based on time or size.

Prep
The results of each event file processed with "prep" command (i.e., replay(i).txt output files) in this case are considered a batch to execute. All such batches are then need to be organized by (sub)directories and defined in config file that is passed to the batch utility.

Utility:

1. Validates config file
2. Sorts batches by the assigned execution order
3. Executes batches sequentially
4. For each batch:

• Create command parameters for each instance based on batch definition
• Start N replay instances as defined based on batch definition
• Wait until all replay instances executed