Adding audio.periods setting to the fluid_pulse audio driver
Adding audio.periods setting to the fluid_pulse audio driver

This common setting was ignored by the PulseAudio driver.
It doesn't change the synthesis buffer size, which is still
the number of frames specified by audio.period-size, but
the number of periods may be raised to request a higher latency
amount, unless audio.pulseaudio.adjust-latency is 1 (the
default). In turn, PulseAudio will grant or not this latency
request. See: [PulseAudio Latency
Control](https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/Developer/Clients/LatencyControl/).

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