Coin should use different Kernel images depending on macOS version

Currently Coin goes through all Kernel images available and selects the first one in the list.

@async_lru_cache(maxsize=1)
async def macKernelImageID() -> str:
image_pool = (await one.imagepool.info(-2, -1, -1))["IMAGE_POOL"]
for image in xmlrpc_childElements(image_pool, "IMAGE"):
if image["TYPE"] == one_image_type.kernel:
return image["ID"]
assert False, "Could not find Mac Kernel image id"

This prevents us from supporting different Kernel images. One that works with macOS 10.13 (and 10.12) does not work with older ones. And one that works with older ones doesn't work with 10.13.

Somehow Coin needs to know which Kernel image is used with which macOS. Hard code it in Coin?