altosui: conflating USB product and vendor IDs is a bad idea

We've now got a USB vendor ID called 'altusmetrum' for generic
altusmetrum devices (old USB ID 0x000A) while the general vendor name
for all devices is 'altusmetrum' as well.

This patch splits vendors and products into separate name spaces,
products are prefixed with product_ and vendor with (oddly) vendor_.

Signed-off-by: Keith Packard <keithp@keithp.com>