Add gpiod consumer label

[easytarget]

What does this PR do and why is it necessary?

Sets the GPIOD label (consumer field) when requesting GPIO pins (with the periphery library); by default the pin consumer is set to periphery while the pin is used. This change simply sets the consumer message to octoprint-[NAME] where 'NAME' is the printer name from the main OctoPrint settings.

How was it tested? How can it be tested by the reviewer?

Tested locally on my system, this trivial enough (arguments added on just two lines) that it can be reviewed and tested on any GPIOD enabled instance. Use gpioinfo | grep "\[used\]" to see the current list of used pins, status and consumer strings

Notes

This is trivial, and this plugin is currently stalled, but if anybody works on it again this would be a 'nice to have' change.

This is the result on my install

daisy@pi:~ $ gpioinfo /dev/gpiochip0 | grep line\ *8
	line   8:      "GPIO8" "periphery" output active-high [used]

becomes:

daisy@pi:~ $ gpioinfo /dev/gpiochip0 | grep line\ *8
	line   8:      "GPIO8" "octoprint-Daisy" output active-high [used]