More Reliable Checks for Drivers

The current implementation of checking for GPU/IB drivers relies on checking to see if CLI tools that come installed with the drivers are functioning (e.g. nvidia-smi, ibstat).

Notably, this relies on these binaries being on the PATH, which can be a source of confusion for containerized environments, but in general, it's not as direct of a method as it could be.

For instance, checking for known kernel modules via lsmod could give us a clearer picture of what drivers have been successfully installed.