asrDtmfTerminationDigit does not send the transcripts

[rammohan-y]

when we configure asrDtmfTerminationDigit in recognizer, pressing the configured digit does not stop continuos ASR and does not send the final transcript immediately instead the transcript is sent only after asrTimeout (if asrTimeout is configured)

[rammohan-y]

also when both finishOnKey and asrDtmfTerminationDigit are configured we need to give first preference to asrDtmfTerminationDigit if ASR already happening (by checking the bufferedTransctipts)