Clear the values of all attributes of the transaction store.

def reset(self):
        """
        Clear the values of all attributes of the transaction store.
        """
        self.getsCounter = 0

        # dictionary of processed requests for each client. Value for each
        # client is a dictionary with request id as key and transaction id as
        # value
        self.processedRequests = {}  # type: Dict[str, Dict[int, str]]

        # dictionary of responses to be sent for each client. Value for each
        # client is an asyncio Queue
        self.responses = {}  # type: Dict[str, asyncio.Queue]

        # dictionary with key as transaction id and `Reply` as
        # value
        self.transactions = {}