For a read transaction, follow these steps:
1. Create the transaction from the read driver of the master agent.
2. Randomize the transaction.
3. Send the transaction from the master agent read driver.
IMPORTANT: The API sent here is non-blocking. If you want to receive transaction information back, the driver return item policy needs to be set here.
rd_transaction = mst_agent.rd_driver.create_transaction("read transaction");