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I'm pretty sure that vacuum line is the one that goes to the petcock. It makes the fuel flow when the bike starts up. The spark plug was just a spare plug they used to plug the line while they were tuning it. The service manager hopefully put the vacuum line on the petcock where it goes and kept the sperk plug.
Riding the bike that way won't hurt the bike. When the petcock is on prime, it bypasses the vacuum function, enabling the carb to get fuel until it starts and creates vacuum. Then you turn the knob to run or reserve, run most of the time. Reserve when the bike starts to run out of gas. Reserve should be used to get to a fuel station.
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