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When there are multiple management libraries installed on a system
not every one will be compatible with the current driver.  This change
improves our management library algorithm to build up a set of discovered
libraries based on glob patterns, and then try all of them until we're able to
load one without error.

If we try to load the CUDA library on an old GPU, it panics and crashes
the server.  This checks the compute capability before we load the
library so we can gracefully fall back to CPU mode.

* gpu: read memory info from all cuda devices

* add `LOOKUP_SIZE` constant

* better constant name

* address comments